A304761 - OEIS

A304761

Number of n X n 0..1 arrays with every element unequal to 2, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero.

0, 3, 16, 1321, 316639, 292676592, 969267512820, 11630662747620895, 503933308340733338752

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

OFFSET

1,2

COMMENTS

Diagonal of A304767.

LINKS

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 18 2018

STATUS

approved