A300261 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

1, 8, 95, 2030, 138215, 20341795, 6717267728, 6293324571337, 14961844070607631

Offset

1,2

Comments

Diagonal of A300267.

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Cf. A300267.

Sequence in context: A003775 A262737 A299747 * A121785 A305587 A229294

Adjacent sequences: A300258 A300259 A300260 * A300262 A300263 A300264

Keyword

nonn

Author

R. H. Hardin, Mar 01 2018

Status

approved