A296681 Number of n X n 0..1 arrays with each 1 adjacent to 1, 2 or 3 king-move neighboring 1's.

1, 12, 210, 11478, 2323514, 1231267842, 2094245366560, 11122215538558651, 176228516137528739528, 8634201557142385630070796

Offset

1,2

Comments

Diagonal of A296688.

Links

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

Example

Some solutions for n=4
..1..1..0..1. .1..1..1..1. .0..1..1..0. .1..0..1..1. .1..1..0..1
..0..1..0..1. .0..0..0..1. .0..0..0..0. .1..0..0..1. .1..1..0..1
..0..1..0..0. .1..0..0..1. .0..0..0..1. .1..0..0..1. .0..0..0..1
..1..0..1..1. .1..0..0..0. .0..0..1..1. .1..0..1..1. .0..0..0..1

Crossrefs

Cf. A296688.

Sequence in context: A027399 A384261 A266910 * A231260 A317199 A281253

Adjacent sequences: A296678 A296679 A296680 * A296682 A296683 A296684

Keyword

nonn

Author

R. H. Hardin, Dec 18 2017

Status

approved