A316124 Number of nXn 0..1 arrays with every element unequal to 1, 2, 3, 5, 6 or 7 king-move adjacent elements, with upper left element zero.

0, 7, 60, 1112, 58172, 6605359, 1573249156, 869530995479, 1186105791644202

Offset

1,2

Comments

Diagonal of A316130.

Links

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

Example

Some solutions for n=5
..0..1..1..1..0. .0..1..1..1..0. .0..0..0..0..1. .0..1..1..0..1
..1..0..1..0..1. .0..0..1..1..1. .0..1..1..0..0. .1..1..0..1..0
..1..1..1..1..1. .0..1..1..1..1. .0..0..0..0..1. .0..0..0..1..0
..1..0..1..1..0. .0..0..1..0..1. .1..0..0..0..0. .0..0..1..1..0
..0..0..1..1..1. .1..0..1..1..0. .0..0..0..1..0. .1..0..1..0..0

Crossrefs

Cf. A316130.

Sequence in context: A222651 A287689 A289874 * A358323 A156545 A292004

Adjacent sequences: A316121 A316122 A316123 * A316125 A316126 A316127

Keyword

nonn

Author

R. H. Hardin, Jun 24 2018

Status

approved