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.

A231211 Number of permutations of [n] avoiding simultaneously consecutive patterns 123, 1432, 2431, and 3421.

Table of values

n a(n)
0 1
1 1
2 2
3 5
4 14
5 46
6 177
7 790
8 4024
9 23056
10 146777
11 1027850
12 7852184
13 64985116
14 579191277
15 5530869310
16 56336971744
17 609708912976
18 6986749484177
19 84510154473170
20 1076016705993704
21 14385283719409636
22 201475033030143477
23 2950048762311387430
24 45073424916825354064

List of values

[1, 1, 2, 5, 14, 46, 177, 790, 4024, 23056, 146777, 1027850, 7852184, 64985116, 579191277, 5530869310, 56336971744, 609708912976, 6986749484177, 84510154473170, 1076016705993704, 14385283719409636, 201475033030143477, 2950048762311387430, 45073424916825354064]

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

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