A305239 Number of n X n 0..1 arrays with every element unequal to 0, 1, 2, 4 or 8 king-move adjacent elements, with upper left element zero.

1, 4, 18, 94, 1134, 12521, 311014, 12726939, 841464188, 99227326734, 19635419823116, 6617813957084794, 3801727775370243509

Offset

1,2

Comments

Diagonal of A305245.

Links

Table of n, a(n) for n=1..13.

Example

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

Crossrefs

Cf. A305245.

Sequence in context: A364475 A059227 A259533 * A370344 A081103 A243325

Adjacent sequences: A305236 A305237 A305238 * A305240 A305241 A305242

Keyword

nonn

Author

R. H. Hardin, May 28 2018

Status

approved