A317232 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

1, 4, 28, 168, 4798, 157007, 8436662, 1148371444, 277147933683, 118428732870726

Offset

1,2

Comments

Diagonal of A317238.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Cf. A317238.

Sequence in context: A320527 A272281 A182190 * A272456 A125687 A272791

Adjacent sequences: A317229 A317230 A317231 * A317233 A317234 A317235

Keyword

nonn

Author

R. H. Hardin, Jul 24 2018

Status

approved