cp's OEIS Frontend

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.

A267436 Number of self-inverse permutations of [2n] with longest increasing subsequence of length n.

Table of values

n a(n)
0 1
1 1
2 5
3 31
4 265
5 2446
6 26069
7 294386
8 3628517
9 46938514
10 645978814
11 9265791393
12 139408562319
13 2174338555026
14 35259402634616
15 590187761512336
16 10209739522685893
17 181678453872654154
18 3326776921054665350
19 62485419303819431072
20 1203772979032614462448

List of values

[1, 1, 5, 31, 265, 2446, 26069, 294386, 3628517, 46938514, 645978814, 9265791393, 139408562319, 2174338555026, 35259402634616, 590187761512336, 10209739522685893, 181678453872654154, 3326776921054665350, 62485419303819431072, 1203772979032614462448]

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

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