A305356 - OEIS

A305356

Number of n X n 0..1 arrays with every element unequal to 0, 2, 3, 5 or 8 king-move adjacent elements, with upper left element zero.

1, 4, 13, 26, 137, 538, 4429, 33136, 321576, 4146990, 63233103

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OFFSET

1,2

COMMENTS

Diagonal of A305360.

LINKS

EXAMPLE

Some solutions for n=5:

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

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

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

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

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

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 31 2018

STATUS

approved