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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.

A264671 Number of (n+1)X(3+1) arrays of permutations of 0..n*4+3 with each element having directed index change -1,-1 1,0 -1,-2 -2,-2 or 0,1.

Table of values

n a(n)
1 1
2 10
3 34
4 145
5 603
6 2417
7 9976
8 40825
9 166985
10 684253
11 2801318
12 11470702
13 46972259
14 192337615
15 787587465
16 3225016272
17 13205769817
18 54075000313
19 221426203265
20 906695582830
21 3712735776142
22 15202904012125
23 62252826121583

List of values

[1, 10, 34, 145, 603, 2417, 9976, 40825, 166985, 684253, 2801318, 11470702, 46972259, 192337615, 787587465, 3225016272, 13205769817, 54075000313, 221426203265, 906695582830, 3712735776142, 15202904012125, 62252826121583]

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

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