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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.

A222649 T(n,k)=Number of nXk 0..2 arrays with no more than floor(nXk/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order.

Table of values

n a(n)
1 1
2 1
3 1
4 1
5 1
6 1
7 4
8 3
9 3
10 4
11 5
12 12
13 5
14 12
15 5
16 14
17 38
18 61
19 61
20 38
21 14
22 17
23 124
24 157
25 457
26 157
27 124
28 17
29 70
30 430
31 1972
32 3411
33 3411
34 1972
35 430
36 70
37 89
38 1530
39 5625
40 31487
41 25724
42 31487
43 5625
44 1530
45 89
46 326
47 5378
48 66494
49 317655
50 640355
51 640355
52 317655
53 66494
54 5378
55 326

List of values

[1, 1, 1, 1, 1, 1, 4, 3, 3, 4, 5, 12, 5, 12, 5, 14, 38, 61, 61, 38, 14, 17, 124, 157, 457, 157, 124, 17, 70, 430, 1972, 3411, 3411, 1972, 430, 70, 89, 1530, 5625, 31487, 25724, 31487, 5625, 1530, 89, 326, 5378, 66494, 317655, 640355, 640355, 317655, 66494, 5378, 326]