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.

A177599 Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, up, up.

Table of values

n a(n)
0 1
1 1
2 20
3 1680
4 347279
5 145417911
6 108103451700
7 130235191847880
8 237916352264650149
9 626620767478218488341
10 2286998940761680215812180
11 11203494211631147331264432480
12 71758642346800717617629677669619
13 587889139521679290927189491977855371

List of values

[1, 1, 20, 1680, 347279, 145417911, 108103451700, 130235191847880, 237916352264650149, 626620767478218488341, 2286998940761680215812180, 11203494211631147331264432480, 71758642346800717617629677669619, 587889139521679290927189491977855371]

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

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