A299508 Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero.

0, 3, 15, 112, 2336, 122197, 17345466, 4446967161, 3109567007082

Offset

1,2

Comments

Diagonal of A299514.

Links

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

Example

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

Crossrefs

Cf. A299514.

Sequence in context: A323772 A058104 A298390 * A299308 A300109 A056053

Adjacent sequences: A299505 A299506 A299507 * A299509 A299510 A299511

Keyword

nonn

Author

R. H. Hardin, Feb 11 2018

Status

approved