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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.

A264879 Number of (2+1)X(n+1) arrays of permutations of 0..n*3+2 with each element having directed index change 0,1 0,-1 -2,0 or 1,1.

Table of values

n a(n)
1 1
2 0
3 1
4 1
5 7
6 20
7 49
8 175
9 323
10 1085
11 2290
12 6489
13 15751
14 41749
15 105514
16 276079
17 706396
18 1825615
19 4714184
20 12103729
21 31297188
22 80431077
23 207561706
24 534335127
25 1377615603
26 3548250067
27 9145959294
28 23561913471
29 60719538527
30 156456169973

List of values

[1, 0, 1, 1, 7, 20, 49, 175, 323, 1085, 2290, 6489, 15751, 41749, 105514, 276079, 706396, 1825615, 4714184, 12103729, 31297188, 80431077, 207561706, 534335127, 1377615603, 3548250067, 9145959294, 23561913471, 60719538527, 156456169973]

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

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