A284107 Number of n X 2 0..1 arrays with the number of 1's king-move adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.

2, 4, 13, 46, 160, 571, 2095, 7802, 29326, 111040, 422862, 1617611, 6210935, 23922207, 92387315, 357629430, 1387192894, 5390374430, 20979391112, 81768490420, 319107181678, 1246785919174, 4876478734046, 19091509694075

Offset: 1

Author

R. H. Hardin, Mar 20 2017

Keywords

• nonn

Comments

Column 2 of A284113.

Examples

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

Links

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

Crossrefs

Cf. A284113.