A300026 Number of n X n 0..1 arrays with every element equal to 0, 1, 3, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

1, 4, 3, 80, 1637, 18775, 1841903, 326461365, 50773963070, 27507422939178

Offset

1,2

Comments

Diagonal of A300030.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Cf. A300030.

Sequence in context: A220556 A371687 A299188 * A349589 A362736 A266255

Adjacent sequences: A300023 A300024 A300025 * A300027 A300028 A300029

Keyword

nonn

Author

R. H. Hardin, Feb 23 2018

Status

approved