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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.

A082971 Number of permutations of {1,2,...,n} containing exactly 3 occurrences of the 132 pattern.

Table of values

n a(n)
4 1
5 14
6 82
7 410
8 1918
9 8657
10 38225
11 166322
12 716170
13 3059864
14 12994936
15 54924212
16 231235054
17 970347575
18 4060697955
19 16952812170
20 70629116910
21 293720506860
22 1219498444500
23 5055891511980
24 20933654593020
25 86571545598642
26 357628915621698
27 1475896409177780

List of values

[1, 14, 82, 410, 1918, 8657, 38225, 166322, 716170, 3059864, 12994936, 54924212, 231235054, 970347575, 4060697955, 16952812170, 70629116910, 293720506860, 1219498444500, 5055891511980, 20933654593020, 86571545598642, 357628915621698, 1475896409177780]

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

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