A299840 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3, 4, 7 or 8 king-move adjacent elements, with upper left element zero.

1, 8, 163, 8245, 1056001, 325878154, 250915415042, 482492497564135, 2293606110081453800

Offset

1,2

Comments

Diagonal of A299844.

Links

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

Example

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

Crossrefs

Cf. A299844.

Sequence in context: A224899 A281830 A299075 * A353777 A230916 A221078

Adjacent sequences: A299837 A299838 A299839 * A299841 A299842 A299843

Keyword

nonn

Author

R. H. Hardin, Feb 20 2018

Status

approved