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.

A189284 Number of permutations p of 1,2,...,n satisfying p(i+5)-p(i)<>5 for all 1<=i<=n-5.

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 24
5 120
6 696
7 4572
8 34260
9 290328
10 2751480
11 28686024
12 328764732
13 4106158164
14 55495145304
15 806797105320
16 12554890849992
17 208164423163908
18 3663256621120548
19 68188490015132040
20 1338490745511631080
21 27630826605742438968

List of values

[1, 1, 2, 6, 24, 120, 696, 4572, 34260, 290328, 2751480, 28686024, 328764732, 4106158164, 55495145304, 806797105320, 12554890849992, 208164423163908, 3663256621120548, 68188490015132040, 1338490745511631080, 27630826605742438968]

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

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