A299800 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero.

1, 7, 20, 174, 7013, 388453, 61726046, 23457257837, 21977588184244

Offset

1,2

Comments

Diagonal of A299806.

Links

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

Example

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

Crossrefs

Cf. A299806.

Sequence in context: A009372 A051102 A299009 * A299676 A300308 A344849

Adjacent sequences: A299797 A299798 A299799 * A299801 A299802 A299803

Keyword

nonn

Author

R. H. Hardin, Feb 19 2018

Status

approved