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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.

A304003 Number of n X n 0..1 arrays with every element unequal to 0, 2, 3 or 5 king-move adjacent elements, with upper left element zero.

Original entry on oeis.org

1, 4, 13, 26, 137, 538, 4224, 30468, 264104, 2993696, 40315467
Offset: 1

Views

Author

R. H. Hardin, May 04 2018

Keywords

Comments

Diagonal of A304010.

Examples

			Some solutions for n=5
..0..0..1..1..0. .0..1..1..1..1. .0..0..0..1..1. .0..0..1..1..1
..1..1..0..0..1. .0..1..1..1..1. .0..0..0..1..1. .0..0..1..1..1
..1..1..1..0..1. .0..1..1..1..1. .0..0..0..0..0. .0..0..0..0..0
..0..0..1..0..1. .0..1..1..1..1. .1..1..1..0..0. .1..1..0..0..0
..1..0..0..1..0. .0..1..1..1..1. .1..1..1..0..0. .1..1..0..0..0

Crossrefs

Cf. A304010.

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