A284193 Number of n X 2 0..1 arrays with the number of 1's horizontally, antidiagonally or vertically adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.

2, 4, 13, 40, 131, 455, 1611, 5818, 21328, 78965, 294721, 1107257, 4182655, 15873631, 60485153, 231287810, 887184904, 3412621088, 13159857176, 50862414259, 196984720481, 764321821293, 2970680947542, 11563991293971, 45079009826426

Offset: 1

Author

R. H. Hardin, Mar 22 2017

Keywords

• nonn

Comments

Column 2 of A284199.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210

Crossrefs

Cf. A284199.