A299676 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero.

1, 7, 20, 211, 13369, 1247427, 346275749, 289785610230, 630726124632782

Offset

1,2

Comments

Diagonal of A299682.

Links

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

Example

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

Crossrefs

Cf. A299682.

Sequence in context: A051102 A299009 A299800 * A300308 A344849 A216457

Adjacent sequences: A299673 A299674 A299675 * A299677 A299678 A299679

Keyword

nonn

Author

R. H. Hardin, Feb 16 2018

Status

approved