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.

A177635 Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, up, up, up, up, up.

Table of values

n a(n)
0 1
1 1
2 20
3 1680
4 369600
5 168168000
6 137225088000
7 182499151015439
8 369333660414653745
9 1080107104118231632500
10 4384231121059173932562000
11 23913914175434871142808715000
12 170693577054027116430454774306800
13 1559452501977701854639515593122328400

List of values

[1, 1, 20, 1680, 369600, 168168000, 137225088000, 182499151015439, 369333660414653745, 1080107104118231632500, 4384231121059173932562000, 23913914175434871142808715000, 170693577054027116430454774306800, 1559452501977701854639515593122328400]

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

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