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.

A000085 Number of self-inverse permutations on n letters, also known as involutions; number of standard Young tableaux with n cells.

Table of values

n a(n)
0 1
1 1
2 2
3 4
4 10
5 26
6 76
7 232
8 764
9 2620
10 9496
11 35696
12 140152
13 568504
14 2390480
15 10349536
16 46206736
17 211799312
18 997313824
19 4809701440
20 23758664096
21 119952692896
22 618884638912
23 3257843882624
24 17492190577600
25 95680443760576
26 532985208200576
27 3020676745975552

List of values

[1, 1, 2, 4, 10, 26, 76, 232, 764, 2620, 9496, 35696, 140152, 568504, 2390480, 10349536, 46206736, 211799312, 997313824, 4809701440, 23758664096, 119952692896, 618884638912, 3257843882624, 17492190577600, 95680443760576, 532985208200576, 3020676745975552]

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

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