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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.

A183827 T(n,k)=1/256 the number of (n+1)X(k+1) 0..3 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.

Table of values

n a(n)
1 1
2 15
3 15
4 225
5 813
6 225
7 3375
8 43947
9 43947
10 3375
11 50625
12 2377341
13 8538066
14 2377341
15 50625
16 759375
17 128578815
18 1661285961
19 1661285961
20 128578815
21 759375
22 11390625
23 6954559893
24 323115202755
25 1163575148283
26 323115202755
27 6954559893
28 11390625

List of values

[1, 15, 15, 225, 813, 225, 3375, 43947, 43947, 3375, 50625, 2377341, 8538066, 2377341, 50625, 759375, 128578815, 1661285961, 1661285961, 128578815, 759375, 11390625, 6954559893, 323115202755, 1163575148283, 323115202755, 6954559893, 11390625]

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

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