A317370 Number of nXn 0..1 arrays with every element unequal to 1, 2, 3, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

0, 7, 91, 4811, 659721, 205048072, 185409601420, 451074475284615, 2822674184876891727

Offset

1,2

Comments

Diagonal of A317376.

Links

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

Example

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

Crossrefs

Cf. A317376.

Sequence in context: A363358 A124557 A195213 * A282041 A027955 A124654

Adjacent sequences: A317367 A317368 A317369 * A317371 A317372 A317373

Keyword

nonn

Author

R. H. Hardin, Jul 26 2018

Status

approved