A305224 Number of n X n 0..1 arrays with every element unequal to 0, 1, 2, 3 or 8 king-move adjacent elements, with upper left element zero.

1, 8, 24, 116, 757, 7062, 135183, 4217359, 251711366, 26201772355, 5004642648682, 1701933414189511, 1046175213710985327, 1152072797809868185976, 2282648962854010752666780, 8117018772747629068352653449

Offset

1,2

Comments

Diagonal of A305230.

Links

Table of n, a(n) for n=1..16.

Example

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

Crossrefs

Cf. A305230.

Sequence in context: A220706 A246030 A010566 * A182068 A092771 A279483

Adjacent sequences: A305221 A305222 A305223 * A305225 A305226 A305227

Keyword

nonn

Author

R. H. Hardin, May 27 2018

Status

approved