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.

A117158 Number of permutations avoiding the consecutive pattern 1234.

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 23
5 111
6 642
7 4326
8 33333
9 288901
10 2782082
11 29471046
12 340568843
13 4263603891
14 57482264322
15 830335952166
16 12793889924553
17 209449977967081
18 3630626729775362
19 66429958806679686
20 1279448352687538463
21 25874432578888440471
22 548178875969847203202

List of values

[1, 1, 2, 6, 23, 111, 642, 4326, 33333, 288901, 2782082, 29471046, 340568843, 4263603891, 57482264322, 830335952166, 12793889924553, 209449977967081, 3630626729775362, 66429958806679686, 1279448352687538463, 25874432578888440471, 548178875969847203202]

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

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