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

Offset

1,2

Comments

Diagonal of A304901.

Links

Table of n, a(n) for n=1..9.

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

Cf. A304901.

Sequence in context: A055066 A216534 A167550 * A161201 A007291 A343137

Adjacent sequences: A304892 A304893 A304894 * A304896 A304897 A304898

Keyword

nonn

Author

R. H. Hardin, May 20 2018

Status

approved