A303683 Number of n X n 0..1 arrays with every element unequal to 2, 3 or 4 king-move adjacent elements, with upper left element zero.

0, 3, 2, 138, 349, 19068, 99205, 5047477, 58634971, 2949491750, 84689499509, 5678370893063

Offset

1,2

Comments

Diagonal of A303690.

Links

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

Example

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

Crossrefs

Cf. A303690.

Sequence in context: A076931 A076932 A244083 * A187825 A297532 A369990

Adjacent sequences: A303680 A303681 A303682 * A303684 A303685 A303686

Keyword

nonn

Author

R. H. Hardin, Apr 28 2018

Status

approved