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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.

A264670 Number of (n+1) X (2+1) arrays of permutations of 0..n*3+2 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 2
3 9
4 19
5 44
6 108
7 264
8 649
9 1573
10 3837
11 9353
12 22801
13 55571
14 135432
15 330113
16 804604
17 1961113
18 4779902
19 11650318
20 28396001
21 69211142
22 168692149
23 411162676
24 1002149647
25 2442594935
26 5953472042
27 14510727488
28 35367800720
29 86203902041

List of values

[1, 2, 9, 19, 44, 108, 264, 649, 1573, 3837, 9353, 22801, 55571, 135432, 330113, 804604, 1961113, 4779902, 11650318, 28396001, 69211142, 168692149, 411162676, 1002149647, 2442594935, 5953472042, 14510727488, 35367800720, 86203902041]

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

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