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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.

A209047 T(n,k)=Number of nXk 0..3 arrays with no element equal the average of immediate neighbors vertically above and horizontally left of it.

Table of values

n a(n)
1 4
2 12
3 12
4 36
5 124
6 36
7 108
8 1300
9 1300
10 108
11 324
12 13644
13 47700
14 13644
15 324
16 972
17 143212
18 1752148
19 1752148
20 143212
21 972
22 2916
23 1503212
24 64369764
25 225262148
26 64369764
27 1503212
28 2916
29 8748
30 15778340
31 2364812680
32 28964458546
33 28964458546

List of values

[4, 12, 12, 36, 124, 36, 108, 1300, 1300, 108, 324, 13644, 47700, 13644, 324, 972, 143212, 1752148, 1752148, 143212, 972, 2916, 1503212, 64369764, 225262148, 64369764, 1503212, 2916, 8748, 15778340, 2364812680, 28964458546, 28964458546]

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

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