A283035 - OEIS

A283035

Number of n X n 0..1 arrays with no 1 equal to more than one of its horizontal and vertical neighbors, with the exception of exactly one element.

0, 4, 119, 9152, 1604067, 706205768, 797350288363, 2355217281173760, 18388049679475271526, 382245292023510825419744

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OFFSET

1,2

COMMENTS

Diagonal of A283042.

LINKS

EXAMPLE

Some solutions for n=4

..1..1..0..0. .1..1..1..0. .0..1..0..0. .1..0..1..1. .0..0..1..0

..0..0..0..1. .0..0..0..0. .0..0..0..1. .0..0..0..0. .0..0..1..1

..1..0..1..0. .1..0..1..0. .1..1..0..0. .1..1..0..1. .0..0..1..0

..0..1..1..1. .1..0..0..0. .1..0..1..0. .1..0..0..1. .0..1..0..1

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 27 2017

STATUS

approved