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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.

A250520 Number of (n+1)X(n+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)-x(i-1,j) in the j direction.

Table of values

n a(n)
1 50
2 1180
3 21955
4 300131
5 3183434
6 27910024
7 212707851
8 1462376991
9 9314700106
10 56025183452
11 322542598187

List of values

[50, 1180, 21955, 300131, 3183434, 27910024, 212707851, 1462376991, 9314700106, 56025183452, 322542598187]

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

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