A305341 Number of n X n 0..1 arrays with every element unequal to 0, 1, 3, 5 or 8 king-move adjacent elements, with upper left element zero.

1, 5, 14, 77, 649, 5408, 64658, 1241359, 29268593, 960816363, 47443906836, 3123256208489, 282016871368240, 36794768206114222

Offset

1,2

Comments

Diagonal of A305347.

Links

Table of n, a(n) for n=1..14.

Example

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

Crossrefs

Cf. A305347.

Sequence in context: A305017 A007838 A306751 * A316611 A174939 A320800

Adjacent sequences: A305338 A305339 A305340 * A305342 A305343 A305344

Keyword

nonn

Author

R. H. Hardin, May 30 2018

Status

approved