A317559 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.

1, 8, 228, 20312, 5721314, 5059110002, 14085130453968, 123418919972164971, 3402595745984823716385

Offset

1,2

Comments

Diagonal of A317565.

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
..0..0..1..1..1. .0..0..1..0..0. .0..0..1..0..0. .0..0..1..1..1
..0..1..1..1..0. .1..0..0..1..1. .1..1..1..1..1. .0..1..1..1..0
..1..0..1..1..1. .0..0..0..1..0. .0..1..0..1..1. .0..0..1..0..1
..1..0..0..1..0. .0..0..1..1..0. .1..1..0..1..1. .1..0..0..0..0

Crossrefs

Cf. A317565.

Sequence in context: A299655 A033508 A320365 * A302735 A300209 A300798

Adjacent sequences: A317556 A317557 A317558 * A317560 A317561 A317562

Keyword

nonn

Author

R. H. Hardin, Jul 31 2018

Status

approved