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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.

A301602 Number of n X n 0..1 arrays with every element equal to 0, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.

Original entry on oeis.org

1, 2, 2, 25, 330, 8888, 591585, 83224304, 23865691820, 14092825824108
Offset: 1

Views

Author

R. H. Hardin, Mar 24 2018

Keywords

Comments

Diagonal of A301608.

Examples

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

Crossrefs

Cf. A301608.

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