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.

A177615 Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, up, up, up, up.

Table of values

n a(n)
0 1
1 1
2 20
3 1680
4 369600
5 168168000
6 137127810959
7 182138398520387
8 367988956112888200
9 1074073326771101149080
10 4350318942513425384777400
11 23673963203663687592089088600
12 168569155472096397352266896207243
13 1536148007688582239667327040442799059

List of values

[1, 1, 20, 1680, 369600, 168168000, 137127810959, 182138398520387, 367988956112888200, 1074073326771101149080, 4350318942513425384777400, 23673963203663687592089088600, 168569155472096397352266896207243, 1536148007688582239667327040442799059]

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

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