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.

A213323 Number of permutations of n objects such that no four-element subset is preserved.

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 0
5 44
6 304
7 2568
8 26704
9 200240
10 1931616
11 20849696
12 246556672
13 3300906816
14 46382446720
15 695413794944
16 11120648673024
17 188600719094528
18 3394592207824384
19 64513420630110720
20 1290420198709682176
21 27102196040419214336
22 596237419436696543232
23 13713106494042086045696

List of values

[1, 1, 2, 6, 0, 44, 304, 2568, 26704, 200240, 1931616, 20849696, 246556672, 3300906816, 46382446720, 695413794944, 11120648673024, 188600719094528, 3394592207824384, 64513420630110720, 1290420198709682176, 27102196040419214336, 596237419436696543232, 13713106494042086045696]

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

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