A284764 Number of n X n 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 one less than the number of 0's adjacent to some 1.

0, 4, 119, 10120, 4219759, 7032604532, 48994677634459, 1392340919671593156

Offset

1,2

Comments

Diagonal of A284771.

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Cf. A284771.

Sequence in context: A285053 A264420 A283035 * A271421 A064204 A054644

Adjacent sequences: A284761 A284762 A284763 * A284765 A284766 A284767

Keyword

nonn

Author

R. H. Hardin, Apr 02 2017

Status

approved