A299944 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

1, 7, 20, 75, 644, 4604, 116051, 5133698, 330723200, 54246156735

Offset

1,2

Comments

Diagonal of A299948.

Links

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

Example

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

Crossrefs

Cf. A299948.

Sequence in context: A196584 A301777 A299181 * A265657 A298214 A299346

Adjacent sequences: A299941 A299942 A299943 * A299945 A299946 A299947

Keyword

nonn

Author

R. H. Hardin, Feb 22 2018

Status

approved