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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.

A207317 T(n,k)=Number of nXk 0..2 arrays avoiding the pattern z-2 z-1 z in any row, column or nw-to-se diagonal.

Table of values

n a(n)
1 3
2 9
3 9
4 26
5 81
6 26
7 75
8 676
9 676
10 75
11 216
12 5625
13 15390
14 5625
15 216
16 622
17 46656
18 347502
19 347502
20 46656
21 622
22 1791
23 386884
24 7791488
25 21162579
26 7791488
27 386884
28 1791
29 5157
30 3207681
31 174545777
32 1274682671
33 1274682671
34 174545777
35 3207681
36 5157
37 14849

List of values

[3, 9, 9, 26, 81, 26, 75, 676, 676, 75, 216, 5625, 15390, 5625, 216, 622, 46656, 347502, 347502, 46656, 622, 1791, 386884, 7791488, 21162579, 7791488, 386884, 1791, 5157, 3207681, 174545777, 1274682671, 1274682671, 174545777, 3207681, 5157, 14849]

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

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