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.

A262132 Number of permutations p of [n] such that the up-down signature of p has nonnegative partial sums with a maximal value <= 7.

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 99224
10 893015
11 9821203
12 108031161
13 1403167368
14 18239614827
15 273001402026
16 4094100409041
17 69325319221265
18 1178005630046455
19 22247669184972959
20 422391796578333725
21 8797758481967862297
22 184548615259788777783

List of values

[1, 1, 1, 3, 9, 45, 225, 1575, 11025, 99224, 893015, 9821203, 108031161, 1403167368, 18239614827, 273001402026, 4094100409041, 69325319221265, 1178005630046455, 22247669184972959, 422391796578333725, 8797758481967862297, 184548615259788777783]

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

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