A304953 - OEIS

A304953

Number of n X n 0..1 arrays with every element unequal to 1, 2, 3, 5 or 7 king-move adjacent elements, with upper left element zero.

0, 7, 42, 496, 11282, 435964, 30361694, 3805684538, 844100991906

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OFFSET

1,2

COMMENTS

Diagonal of A304959.

LINKS

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 22 2018

STATUS

approved