A317566 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 3, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

1, 8, 170, 9513, 1489357, 611929512, 703696012516, 2224035714999860, 19157046204651408615

Offset

1,2

Comments

Diagonal of A317572.

Links

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

Example

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

Crossrefs

Cf. A317572.

Sequence in context: A096486 A303463 A300805 * A301444 A333036 A247729

Adjacent sequences: A317563 A317564 A317565 * A317567 A317568 A317569

Keyword

nonn

Author

R. H. Hardin, Jul 31 2018

Status

approved