A298706 Number of n X n 0..1 arrays with every element equal to 1, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero.

0, 4, 0, 11, 781, 3950, 17377, 8695221, 359275256, 26141521994

Offset

1,2

Comments

Diagonal of A298712.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Cf. A298712.

Sequence in context: A373742 A298449 A298056 * A369911 A260490 A349712

Adjacent sequences: A298703 A298704 A298705 * A298707 A298708 A298709

Keyword

nonn

Author

R. H. Hardin, Jan 25 2018

Status

approved