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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.

A251974 T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with nondecreasing sum of every two consecutive values in every row and column.

Table of values

n a(n)
1 256
2 1600
3 1600
4 10000
5 20000
6 10000
7 40000
8 250000
9 250000
10 40000
11 160000
12 1750000
13 6250000
14 1750000
15 160000
16 490000
17 12250000
18 76562500
19 76562500
20 12250000
21 490000
22 1500625
23 60025000
24 937890625
25 1500625000
26 937890625

List of values

[256, 1600, 1600, 10000, 20000, 10000, 40000, 250000, 250000, 40000, 160000, 1750000, 6250000, 1750000, 160000, 490000, 12250000, 76562500, 76562500, 12250000, 490000, 1500625, 60025000, 937890625, 1500625000, 937890625]

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

Content is available under The OEIS End-User License Agreement.