A316298 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 4, 6 or 8 king-move adjacent elements, with upper left element zero.

1, 4, 20, 114, 1519, 20780, 608947, 26898537, 2095245767, 277347563288

Offset

1,2

Comments

Diagonal of A316304.

Links

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

Example

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

Crossrefs

Cf. A316304.

Sequence in context: A028475 A128327 A320615 * A291531 A171802 A361245

Adjacent sequences: A316295 A316296 A316297 * A316299 A316300 A316301

Keyword

nonn

Author

R. H. Hardin, Jun 29 2018

Status

approved