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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.

A202553 Number of n X n 0,1 arrays with the row and column sums nondecreasing.

Original entry on oeis.org

2, 8, 66, 1526, 103806, 22360610, 15635171834, 36727396390100
Offset: 1

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Author

R. H. Hardin Dec 21 2011

Keywords

Comments

Diagonal of A202560

Examples

			Some solutions for n=4
..0..0..0..1....1..1..0..0....0..0..1..1....0..0..0..0....0..0..0..1
..0..1..1..0....0..0..1..1....0..1..1..1....0..1..0..0....0..0..0..1
..0..0..1..1....0..1..0..1....1..1..0..1....1..0..1..1....0..1..1..1
..1..1..0..1....1..0..1..0....1..0..1..1....0..1..1..1....0..1..1..1

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