A305090 - OEIS

A305090

Number of n X n 0..1 arrays with every element unequal to 1, 2, 4, 6 or 7 king-move adjacent elements, with upper left element zero.

0, 3, 14, 20, 333, 7273, 23368, 566292, 64803044, 910350286, 37491702178

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OFFSET

1,2

COMMENTS

Diagonal of A305097.

LINKS

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 25 2018

STATUS

approved