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.

A138162 Number of permutations of {1,2,...,n} containing exactly 4 occurrences of the 132 pattern.

Table of values

n a(n)
5 12
6 96
7 526
8 2593
9 12165
10 55482
11 248509
12 1099255
13 4817998
14 20968680
15 90747564
16 390927869
17 1677551078
18 7174848666
19 30598014925
20 130155932685
21 552386655300
22 2339526458640
23 9890067346740
24 41737405295250
25 175859194700958

List of values

[12, 96, 526, 2593, 12165, 55482, 248509, 1099255, 4817998, 20968680, 90747564, 390927869, 1677551078, 7174848666, 30598014925, 130155932685, 552386655300, 2339526458640, 9890067346740, 41737405295250, 175859194700958]

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

Content is available under The OEIS End-User License Agreement.