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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A352099 Number of inequivalent {-1,1} matrices of order n, up to permutation of rows and/or columns and multiplication of rows and/or columns by -1.

Table of values

n a(n)
1 1
2 2
3 3
4 12
5 39
6 388
7 8102
8 656108
9 199727714
10 224693292768
11 893966897828288
12 12397352268917562436
13 598097093939369977901540
14 100707091308314174859433507948
15 59497535893138933753768955970555554
16 124081719421265185713331815803874814236572
17 919072633264334061873768956083917736204779032768

List of values

[1, 2, 3, 12, 39, 388, 8102, 656108, 199727714, 224693292768, 893966897828288, 12397352268917562436, 598097093939369977901540, 100707091308314174859433507948, 59497535893138933753768955970555554, 124081719421265185713331815803874814236572, 919072633264334061873768956083917736204779032768]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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