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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.

A250443 T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with nondecreasing sum of every two consecutive values in every row and column.

Table of values

n a(n)
1 81
2 324
3 324
4 1296
5 2160
6 1296
7 3600
8 14400
9 14400
10 3600
11 10000
12 60000
13 160000
14 60000
15 10000
16 22500
17 250000
18 1000000
19 1000000
20 250000
21 22500
22 50625
23 787500
24 6250000
25 8750000
26 6250000
27 787500
28 50625
29 99225
30 2480625
31 27562500
32 76562500

List of values

[81, 324, 324, 1296, 2160, 1296, 3600, 14400, 14400, 3600, 10000, 60000, 160000, 60000, 10000, 22500, 250000, 1000000, 1000000, 250000, 22500, 50625, 787500, 6250000, 8750000, 6250000, 787500, 50625, 99225, 2480625, 27562500, 76562500]

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

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