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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.

A186558 T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with no 2X2 subblock commuting with any of its horizontal and vertical 2X2 subblock neighbors.

Table of values

n a(n)
1 256
2 3891
3 3891
4 60074
5 227890
6 60074
7 927477
8 13360840
9 13360840
10 927477
11 14319230
12 783375343
13 2976803436
14 783375343
15 14319230
16 221073168
17 45931015744
18 663296784123
19 663296784123
20 45931015744
21 221073168
22 3413126694

List of values

[256, 3891, 3891, 60074, 227890, 60074, 927477, 13360840, 13360840, 927477, 14319230, 783375343, 2976803436, 783375343, 14319230, 221073168, 45931015744, 663296784123, 663296784123, 45931015744, 221073168, 3413126694]

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

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