A284767 Number of n X 4 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.

2, 52, 720, 10120, 145822, 2134812, 31677488, 474539092, 7162528912, 108751977400, 1659266548448, 25419213710160, 390755520225882, 6024619021179564, 93124153758520074, 1442654093474307468

Offset: 1

Author

R. H. Hardin, Apr 02 2017

Keywords

• nonn

Comments

Column 4 of A284771.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..173

Crossrefs

Cf. A284771.