A284158 Number of n X n 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.

1, 4, 62, 5888, 2179255, 3648835932, 25064817057781, 708804054303474038

Offset: 1

Author

R. H. Hardin, Mar 21 2017

Keywords

• nonn

Comments

Diagonal of A284165.

Examples

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

Crossrefs

Cf. A284165.