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.

A000388 Number of permutations of an n-sequence discordant with three given permutations (see reference) in n-2 places.

Table of values

n a(n)
4 6
5 20
6 180
7 1106
8 9292
9 82980
10 831545
11 9139482
12 109595496
13 1423490744
14 19911182207
15 298408841160
16 4770598226296
17 81037124739588
18 1457607971046492
19 27675791180024802
20 553166885187641670
21 11609691036091870428
22 255273744004170486155
23 5868308906885934514178

List of values

[6, 20, 180, 1106, 9292, 82980, 831545, 9139482, 109595496, 1423490744, 19911182207, 298408841160, 4770598226296, 81037124739588, 1457607971046492, 27675791180024802, 553166885187641670, 11609691036091870428, 255273744004170486155, 5868308906885934514178]

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

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