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.

A213322 Number of permutations of n objects such that no three-element subset is preserved.

Table of values

n a(n)
0 1
1 1
2 2
3 0
4 9
5 54
6 459
7 2568
8 20145
9 176076
10 1833741
11 20148336
12 241870617
13 3132196560
14 43874128089
15 658195206264
16 10533823597089
17 179062417518768
18 3223079582143185
19 61237777946016096
20 1224762717659002281
21 25720036368344942616
22 565841009719801635777

List of values

[1, 1, 2, 0, 9, 54, 459, 2568, 20145, 176076, 1833741, 20148336, 241870617, 3132196560, 43874128089, 658195206264, 10533823597089, 179062417518768, 3223079582143185, 61237777946016096, 1224762717659002281, 25720036368344942616, 565841009719801635777]

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

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