A317154 Number of nXn 0..1 arrays with every element unequal to 0, 1, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.

1, 5, 14, 105, 2345, 69701, 20168266, 13792577708, 18922956181705

Offset

1,2

Comments

Diagonal of A317160.

Links

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

Example

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

Crossrefs

Cf. A317160.

Sequence in context: A370006 A375521 A316233 * A283785 A267351 A058072

Adjacent sequences: A317151 A317152 A317153 * A317155 A317156 A317157

Keyword

nonn

Author

R. H. Hardin, Jul 22 2018

Status

approved