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.

A320981 Number of permutations p of [n] such that the up-down signature of p has nonnegative partial sums with a maximal value of seven.

Table of values

n a(n)
7 0
8 1
9 8
10 1031
11 9379
12 486299
13 5084162
14 196352061
15 2352460536
16 81070646577
17 1103813259377
18 36592927821767
19 560827842703887
20 18549898652794829
21 317078625531545481
22 10667284286197389079
23 201655098112826170280
24 6973904694490809821089
25 144705018721890264334923

List of values

[0, 1, 8, 1031, 9379, 486299, 5084162, 196352061, 2352460536, 81070646577, 1103813259377, 36592927821767, 560827842703887, 18549898652794829, 317078625531545481, 10667284286197389079, 201655098112826170280, 6973904694490809821089, 144705018721890264334923]

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

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