A317211 Number of nXn 0..1 arrays with every element unequal to 0, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.

1, 4, 23, 959, 127358, 53479785, 66735041323, 247944910114486, 2724578446333546605

Offset

1,2

Comments

Diagonal of A317215.

Links

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

Example

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

Crossrefs

Cf. A317215.

Sequence in context: A304413 A316240 A305948 * A145514 A305665 A319145

Adjacent sequences: A317208 A317209 A317210 * A317212 A317213 A317214

Keyword

nonn

Author

R. H. Hardin, Jul 23 2018

Status

approved