A283035 Number of n X n 0..1 arrays with no 1 equal to more than one of its horizontal and vertical neighbors, with the exception of exactly one element.

0, 4, 119, 9152, 1604067, 706205768, 797350288363, 2355217281173760, 18388049679475271526, 382245292023510825419744

Offset

1,2

Comments

Diagonal of A283042.

Links

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

Example

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

Crossrefs

Cf. A283042.

Sequence in context: A096464 A285053 A264420 * A284764 A271421 A378928

Adjacent sequences: A283032 A283033 A283034 * A283036 A283037 A283038

Keyword

nonn

Author

R. H. Hardin, Feb 27 2017

Status

approved