A299181 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4, 6 or 7 king-move adjacent elements, with upper left element zero.

1, 7, 20, 75, 626, 3773, 59287, 1666826, 51863841, 3412264531

Offset

1,2

Comments

Diagonal of A299187.

Links

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

Example

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

Crossrefs

Cf. A299187.

Sequence in context: A222549 A196584 A301777 * A299944 A265657 A298214

Adjacent sequences: A299178 A299179 A299180 * A299182 A299183 A299184

Keyword

nonn

Author

R. H. Hardin, Feb 04 2018

Status

approved