oeis2 alternatives and similar packages
Based on the "Math" category.
Alternatively, view oeis2 alternatives based on common mentions on social networks and blogs.

vector
An efficient implementation of Intindexed arrays (both mutable and immutable), with a powerful loop optimisation framework . 
statistics
A fast, high quality library for computing with statistics in Haskell. 
HerbiePlugin
GHC plugin that improves Haskell code's numerical stability 
hgeometry
HGeometry is a library for computing with geometric objects in Haskell. It defines basic geometric types and primitives, and it implements some geometric data structures and algorithms. The main two focusses are: (1) Strong type safety, and (2) implementations of geometric algorithms and data structures that have good asymptotic running time guarantees. 
dimensional
Dimensional library variant built on Data Kinds, Closed Type Families, TypeNats (GHC 7.8+). 
computationalalgebra
GeneralPurpose Computer Algebra System as an EDSL in Haskell 
mwcrandom
A very fast Haskell library for generating high quality pseudorandom numbers. 
numhask
A haskell numeric prelude, providing a clean structure for numbers and operations that combine them. 
poly
Fast polynomial arithmetic in Haskell (dense and sparse, univariate and multivariate, usual and Laurent) 
cf
"Exact" real arithmetic for Haskell using continued fractions (Not formally proven correct) 
optimization
Some numerical optimization methods implemented in Haskell 
equationalreasoning
Agdastyle equational reasoning in Haskell 
safedecimal
Safe and very efficient arithmetic operations on fixed decimal point numbers 
monoidsubclasses
Subclasses of Monoid with a solid theoretical foundation and practical purposes 
eigen
Haskel binding for Eigen library. Eigen is a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.
Less time debugging, more time building
* Code Quality Rankings and insights are calculated and provided by Lumnify.
They vary from L1 to L5 with "L5" being the highest.
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README
oeis2
Haskell interface for Online Encyclopedia of Integer Sequences; homage to oeis.
Difference from oeis
 Source data of OEIS.
: oeis usefmt=text
, but this library usefmt=json
.  Possible to get all search results.
 Search functions from ID or subsequence are merged.
 Possibele to search from other than ID or subsequence.
 Support for HTTPS.
Usage
Add import statement.
import Math.OEIS
Get all search results from subsequence
If
n == 0
, you get all search results.ghci>searchSeq (SubSeq [1,2,3,4]) 0 [OEIS {number = "A000027", ids = ["M0472","N0173"], seqData = [1,2,3,4,5,6,7,... ghci>length it 53
Otherwise, you get first
n
search results.ghci>searchSeq (SubSeq [1,2,3,4]) 17 [OEIS {number = "A000027", ids = ["M0472","N0173"], seqData = [1,2,3,4,5,6,7,8,9, ghci>length it 17
Get first few terms from subsequence
ghci>getSeqData (SubSeq [1,2,2,3,3,3,4,4,4,4]) Just [1,2,2,3,3,3,4,4,4,4,5,5,5,5,5,6,6,6,6,6,6,7,7,7,7,7,7,7,...
Get Mathematica function from subsequence
ghci>mathematica <$> lookupSeq (SubSeq [1,2,2,3,3,3,4,4,4,4]) Just ["a[1] = 1; a[n_] := a[n] = a[n  a[n  1]] + 1 (* _Branko Curgus_, May 12 2009 *)","Table[n, {n, 13}, {n}] // Flatten (* _Robert G. Wilson v_, May 11 2010 *)"]
If no search result
ghci>lookupSeq (ID "1145141919893") Nothing
*Note that all licence references and agreements mentioned in the oeis2 README section above
are relevant to that project's source code only.