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.

A189282 Number of permutations p of 1,2,...,n satisfying p(i+3)-p(i)<>3 for all 1<=i<=n-3.

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 22
5 98
6 534
7 3414
8 25498
9 217338
10 2080990
11 22076030
12 256888218
13 3252308706
14 44497313158
15 654139144158
16 10281397705242
17 172033123244330
18 3052895403376110
19 57266799403366334
20 1132124282036449570
21 23524895818926592242

List of values

[1, 1, 2, 6, 22, 98, 534, 3414, 25498, 217338, 2080990, 22076030, 256888218, 3252308706, 44497313158, 654139144158, 10281397705242, 172033123244330, 3052895403376110, 57266799403366334, 1132124282036449570, 23524895818926592242]

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

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