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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.

A222444 T(n,k) = number of n X k 0..3 arrays with entries increasing mod 4 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 21
6 9
7 27
8 147
9 147
10 27
11 81
12 1029
13 2403
14 1029
15 81
16 243
17 7203
18 39285
19 39285
20 7203
21 243
22 729
23 50421
24 642249
25 1500183
26 642249
27 50421
28 729
29 2187
30 352947
31 10499787
32 57289767
33 57289767
34 10499787
35 352947
36 2187
37 6561
38 2470629
39 171655443

List of values

[1, 3, 3, 9, 21, 9, 27, 147, 147, 27, 81, 1029, 2403, 1029, 81, 243, 7203, 39285, 39285, 7203, 243, 729, 50421, 642249, 1500183, 642249, 50421, 729, 2187, 352947, 10499787, 57289767, 57289767, 10499787, 352947, 2187, 6561, 2470629, 171655443]

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

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