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.

A262134 Number of permutations p of [n] such that the up-down signature of p has nonnegative partial sums with a maximal value <= 9.

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 893025
11 9823274
12 108056013
13 1404720092
14 18261352963
15 273907724376
16 4108601566641
17 69834315000567
18 1187167554049581
19 22546611220735671
20 428370636959431545
21 8988329939437212520
22 188741185272961560031

List of values

[1, 1, 1, 3, 9, 45, 225, 1575, 11025, 99225, 893025, 9823274, 108056013, 1404720092, 18261352963, 273907724376, 4108601566641, 69834315000567, 1187167554049581, 22546611220735671, 428370636959431545, 8988329939437212520, 188741185272961560031]

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

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