A304895 - OEIS

A304895

Number of n X n 0..1 arrays with every element unequal to 1, 2, 3, 4 or 7 king-move adjacent elements, with upper left element zero.

0, 7, 62, 2373, 107723, 11067544, 2256313057, 816589152784, 612719659755750

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Diagonal of A304901.

LINKS

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 20 2018

STATUS

approved