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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.

A177475 Number of permutations of order n avoiding the consecutive pattern 131'2.

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 20
5 81
6 390
7 2161
8 13678
9 96983
10 764368
11 6630898
12 62748250
13 643442919
14 7104914398
15 84062375725
16 1060919238874
17 14226075039395
18 201982580807466
19 3027049675655253
20 47753241018325280
21 790998083929598213
22 13726222157931958274
23 249018700470309832015
24 4714071198944211367704

List of values

[1, 1, 2, 6, 20, 81, 390, 2161, 13678, 96983, 764368, 6630898, 62748250, 643442919, 7104914398, 84062375725, 1060919238874, 14226075039395, 201982580807466, 3027049675655253, 47753241018325280, 790998083929598213, 13726222157931958274, 249018700470309832015, 4714071198944211367704]

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

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