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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.

A327015 Number of equivalence classes of pairs of permutations in S_n where two pairs are equivalent if they are simultaneously conjugate to each other or simultaneously conjugate to each other after a reversal of one pair.

Table of values

n a(n)
0 1
1 1
2 3
3 8
4 28
5 98
6 518
7 3096
8 23415
9 201795
10 1973189
11 21347935
12 253282652
13 3263902430

List of values

[1, 1, 3, 8, 28, 98, 518, 3096, 23415, 201795, 1973189, 21347935, 253282652, 3263902430]

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

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