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.

A217321 Number of self-inverse permutations in S_n with longest increasing subsequence of length 9.

Table of values

n a(n)
9 1
10 9
11 89
12 639
13 4655
14 30330
15 198148
16 1233743
17 7694099
18 46938514
19 287070944
20 1738940782
21 10570927022
22 64059763010
23 389873574058
24 2373799261605
25 14522526860316
26 89060416668016
27 548932942208392
28 3395326330414774
29 21109553761623110
30 131785019270029876

List of values

[1, 9, 89, 639, 4655, 30330, 198148, 1233743, 7694099, 46938514, 287070944, 1738940782, 10570927022, 64059763010, 389873574058, 2373799261605, 14522526860316, 89060416668016, 548932942208392, 3395326330414774, 21109553761623110, 131785019270029876]

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

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