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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.

A251373 T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock summing to 1 2 3 4 5 6 or 7.

Table of values

n a(n)
1 79
2 695
3 695
4 6113
5 17969
6 6113
7 53769
8 464393
9 464393
10 53769
11 472943
12 12002283
13 35257505
14 12002283
15 472943
16 4159927
17 310199103
18 2676962017
19 2676962017
20 310199103
21 4159927
22 36590017
23 8017100977
24 203249994369
25 597108952883

List of values

[79, 695, 695, 6113, 17969, 6113, 53769, 464393, 464393, 53769, 472943, 12002283, 35257505, 12002283, 472943, 4159927, 310199103, 2676962017, 2676962017, 310199103, 4159927, 36590017, 8017100977, 203249994369, 597108952883]

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

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