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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.

A264373 Number of (n+1)X(2+1) arrays of permutations of 0..n*3+2 with each element having directed index change 2,-2 -1,0 -1,2 1,0 or 0,-1.

Table of values

n a(n)
1 2
2 1
3 13
4 25
5 128
6 347
7 1343
8 4172
9 14711
10 48187
11 164644
12 549209
13 1857120
14 6231551
15 21001218
16 70602740
17 237686843
18 799548823
19 2690789595
20 9053237740
21 30464275277
22 102504319825
23 344916282634
24 1160576447091
25 3905173385325
26 13140236820844

List of values

[2, 1, 13, 25, 128, 347, 1343, 4172, 14711, 48187, 164644, 549209, 1857120, 6231551, 21001218, 70602740, 237686843, 799548823, 2690789595, 9053237740, 30464275277, 102504319825, 344916282634, 1160576447091, 3905173385325, 13140236820844]

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

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