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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.

A264275 Number of (4+1) X (n+1) arrays of permutations of 0..n*5+4 with each element having index change +-(.,.) 0,0 1,0 or 1,2.

Table of values

n a(n)
1 64
2 1800
3 50625
4 1143000
5 25806400
6 600090240
7 13954224384
8 323177889984
9 7484754845584
10 173362944655124
11 4015456912022689
12 93006360976711231
13 2154221392895732449
14 49896286681978765567
15 1155702674228671452961
16 26768498558076022772640
17 620014585959103244313600

List of values

[64, 1800, 50625, 1143000, 25806400, 600090240, 13954224384, 323177889984, 7484754845584, 173362944655124, 4015456912022689, 93006360976711231, 2154221392895732449, 49896286681978765567, 1155702674228671452961, 26768498558076022772640, 620014585959103244313600]

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

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