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

1,1

Comments

Column 4 of A284771.

Links

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

Example

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

Crossrefs

Cf. A284771.

Sequence in context: A034311 A053317 A123803 * A101930 A297756 A174779

Adjacent sequences: A284764 A284765 A284766 * A284768 A284769 A284770

Keyword

nonn

Author

R. H. Hardin, Apr 02 2017

Status

approved