A316759 Number of nXn 0..1 arrays with every element unequal to 2, 3, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

0, 3, 4, 410, 26845, 2605126, 1169271436, 947123604065, 1765677169210138

Offset

1,2

Comments

Diagonal of A316763.

Links

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

Example

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

Crossrefs

Cf. A316763.

Sequence in context: A305505 A069970 A305169 * A334471 A153063 A165499

Adjacent sequences: A316756 A316757 A316758 * A316760 A316761 A316762

Keyword

nonn

Author

R. H. Hardin, Jul 12 2018

Status

approved