A296820 Number of n X n 0..1 arrays with each 1 adjacent to 2, 3 or 4 king-move neighboring 1's.

1, 6, 94, 2272, 510086, 267542809, 364592446431, 2034946979145210, 34966993876417278748

Offset

1,2

Comments

Diagonal of A296827.

Links

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

Example

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

Crossrefs

Cf. A296827.

Sequence in context: A221525 A321073 A198257 * A184983 A184980 A184981

Adjacent sequences: A296817 A296818 A296819 * A296821 A296822 A296823

Keyword

nonn

Author

R. H. Hardin, Dec 21 2017

Status

approved