A317859 Number of nX4 0..1 arrays with every element unequal to 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

2, 10, 19, 56, 155, 313, 851, 2147, 5513, 14288, 37168, 97738, 256043, 672477, 1769569, 4660622, 12294064, 32431038, 85627690, 226117938, 597377797, 1578473210, 4171676388, 11026596808, 29148466909, 77059555630, 203733482276

Offset

1,1

Comments

Column 4 of A317863.

Links

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

Example

Some solutions for n=5
..0..1..1..0. .0..1..0..1. .0..1..0..1. .0..1..0..1. .0..0..0..0
..0..1..0..1. .1..1..1..1. .0..0..0..1. .1..1..1..0. .1..0..1..1
..0..0..1..1. .0..1..0..0. .0..1..1..0. .1..1..1..1. .0..0..1..1
..1..1..1..0. .1..1..0..1. .0..1..1..1. .0..0..1..0. .0..0..1..0
..1..0..1..1. .0..0..0..0. .0..1..1..0. .0..1..1..1. .1..1..1..1

Crossrefs

Cf. A317863.

Sequence in context: A039560 A299577 A259096 * A342543 A342539 A346810

Adjacent sequences: A317856 A317857 A317858 * A317860 A317861 A317862

Keyword

nonn

Author

R. H. Hardin, Aug 09 2018

Status

approved