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.

A152500 1/4 the number of permutations of 3 indistinguishable copies of 1..n with exactly 3 local maxima.

Table of values

n a(n)
1 0
2 1
3 231
4 21490
5 1476084
6 90050080
7 5228286336
8 297239712256
9 16749407726592
10 940343619493888
11 52712719000338432
12 2953100593082269696
13 165399775808105742336
14 9262957817232621568000
15 518737995604927325405184
16 29049593918675470746910720
17 1626782962901824260072800256

List of values

[0, 1, 231, 21490, 1476084, 90050080, 5228286336, 297239712256, 16749407726592, 940343619493888, 52712719000338432, 2953100593082269696, 165399775808105742336, 9262957817232621568000, 518737995604927325405184, 29049593918675470746910720, 1626782962901824260072800256]

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

Content is available under The OEIS End-User License Agreement.