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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.

A222169 T(n,k)=Number of nXk 0..4 arrays with entries increasing mod 5 by 0, 1 or 2 rightwards and downwards, starting with upper left zero.

Table of values

n a(n)
1 1
2 3
3 3
4 9
5 19
6 9
7 27
8 121
9 121
10 27
11 81
12 771
13 1665
14 771
15 81
16 243
17 4913
18 22979
19 22979
20 4913
21 243
22 729
23 31307
24 317259
25 690437
26 317259
27 31307
28 729
29 2187
30 199497
31 4380445
32 20780181
33 20780181
34 4380445
35 199497
36 2187
37 6561
38 1271251
39 60481881
40 625649047

List of values

[1, 3, 3, 9, 19, 9, 27, 121, 121, 27, 81, 771, 1665, 771, 81, 243, 4913, 22979, 22979, 4913, 243, 729, 31307, 317259, 690437, 317259, 31307, 729, 2187, 199497, 4380445, 20780181, 20780181, 4380445, 199497, 2187, 6561, 1271251, 60481881, 625649047]

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

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