A305948 - OEIS

A305948

Number of nXn 0..1 arrays with every element unequal to 0, 2, 3, 4, 5 or 7 king-move adjacent elements, with upper left element zero.

1, 4, 23, 959, 126733, 52618569, 64233268442, 231757210785889, 2449990554327149088

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

OFFSET

1,2

COMMENTS

Diagonal of A305954.

LINKS

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 15 2018

STATUS

approved