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.

A262168 Number of permutations p of [n] such that the up-down signature of 0,p has nonnegative partial sums with a maximal value <= 6.

Table of values

n a(n)
0 1
1 1
2 2
3 5
4 20
5 87
6 522
7 3270
8 26160
9 214424
10 2144240
11 21705682
12 260468184
13 3134839134
14 43887747876
15 611561379844
16 9784982077504
17 154830562162384
18 2786950118922912
19 49340681212898288
20 986813624257965760
21 19321622221580752560
22 425075688874776556320

List of values

[1, 1, 2, 5, 20, 87, 522, 3270, 26160, 214424, 2144240, 21705682, 260468184, 3134839134, 43887747876, 611561379844, 9784982077504, 154830562162384, 2786950118922912, 49340681212898288, 986813624257965760, 19321622221580752560, 425075688874776556320]

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

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