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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.

A264472 Number of (n+1) X (4+1) arrays of permutations of 0..n*5+4 with each element having directed index change 0,1 1,0 2,1 or -1,-1.

Table of values

n a(n)
1 0
2 8
3 16
4 120
5 456
6 2232
7 10116
8 45792
9 212112
10 960336
11 4418388
12 20134008
13 92208780
14 421315344
15 1926779076
16 8809428456
17 40277366640
18 184164908040
19 842016117672
20 3849965354232
21 17602701446772
22 80483933441520
23 367989633268848

List of values

[0, 8, 16, 120, 456, 2232, 10116, 45792, 212112, 960336, 4418388, 20134008, 92208780, 421315344, 1926779076, 8809428456, 40277366640, 184164908040, 842016117672, 3849965354232, 17602701446772, 80483933441520, 367989633268848]

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

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