A305587 Number of n X n 0..1 arrays with every element unequal to 0, 1, 2, 3, 5 or 6 king-move adjacent elements, with upper left element zero.

1, 8, 95, 2451, 126484, 13941521, 3190446497, 1517186100046, 1505396101042225

Offset

1,2

Comments

Diagonal of A305593.

Links

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

Example

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

Crossrefs

Cf. A305593.

Sequence in context: A299747 A300261 A121785 * A229294 A241813 A116144

Adjacent sequences: A305584 A305585 A305586 * A305588 A305589 A305590

Keyword

nonn

Author

R. H. Hardin, Jun 05 2018

Status

approved