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.

A262133 Number of permutations p of [n] such that the up-down signature of p has nonnegative partial sums with a maximal value <= 8.

Table of values

n a(n)
0 1
1 1
2 1
3 3
4 9
5 45
6 225
7 1575
8 11025
9 99225
10 893024
11 9823264
12 108051897
13 1404674661
14 18256733309
15 273850999635
16 4104997257175
17 69784953371975
18 1184628370304553
19 22507939035786507
20 426574822311932257
21 8958071268550577397
22 187401362296416433302

List of values

[1, 1, 1, 3, 9, 45, 225, 1575, 11025, 99225, 893024, 9823264, 108051897, 1404674661, 18256733309, 273850999635, 4104997257175, 69784953371975, 1184628370304553, 22507939035786507, 426574822311932257, 8958071268550577397, 187401362296416433302]

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

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