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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.

A060350 The sum over all subsets S of [n] of the squares of the number of permutations with descent set = S.

Table of values

n a(n)
0 1
1 1
2 2
3 10
4 88
5 1216
6 24176
7 654424
8 23136128
9 1035227008
10 57186502912
11 3822411268864
12 304059285928960
13 28385946491599360
14 3073391215118186496
15 381995951933025287680
16 54020316243835807039488
17 8624091617045072628121600
18 1543536018434416280510332928

List of values

[1, 1, 2, 10, 88, 1216, 24176, 654424, 23136128, 1035227008, 57186502912, 3822411268864, 304059285928960, 28385946491599360, 3073391215118186496, 381995951933025287680, 54020316243835807039488, 8624091617045072628121600, 1543536018434416280510332928]

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

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