A299384 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4, 6 or 8 king-move adjacent elements, with upper left element zero.

1, 7, 20, 46, 310, 1002, 4929, 28917, 170693, 1255834, 10402982, 92718038

Offset

1,2

Comments

Diagonal of A299388.

Links

Table of n, a(n) for n=1..12.

Example

Some solutions for n=7
..0..1..0..1..1..0..1. .0..0..1..0..1..0..1. .0..0..1..0..0..1..1
..0..1..0..0..0..1..0. .1..1..0..1..0..0..1. .1..0..1..1..0..1..0
..0..1..0..0..0..1..1. .0..1..1..1..0..1..0. .0..0..1..1..0..0..0
..1..0..0..0..0..0..0. .1..0..0..0..0..1..0. .1..1..1..1..1..1..1
..1..0..1..0..1..0..1. .0..1..0..0..0..1..0. .0..1..0..1..1..1..0
..0..1..0..0..0..1..1. .0..1..0..0..0..0..1. .0..1..0..1..1..1..0
..1..1..0..1..1..0..0. .0..1..0..1..1..1..0. .0..1..0..1..0..0..1

Crossrefs

Cf. A299388.

Sequence in context: A159222 A100206 A298288 * A007044 A047862 A264879

Adjacent sequences: A299381 A299382 A299383 * A299385 A299386 A299387

Keyword

nonn

Author

R. H. Hardin, Feb 09 2018

Status

approved