A317862 Number of nX7 0..1 arrays with every element unequal to 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

8, 102, 164, 851, 2616, 9045, 33238, 116271, 405766, 1489264, 5416535, 20000458, 73575709, 273375552, 1015670766, 3790505262, 14158662304, 52983894317, 198495708632, 744119241519, 2791930147584, 10479343979306, 39350143779387

Offset

1,1

Comments

Column 7 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. .0..0..1..0..0..1..0. .0..1..1..0..1..0..0
..1..1..1..0..0..0..0. .1..0..0..0..1..1..0. .1..1..1..1..1..0..1
..1..0..0..1..0..1..0. .0..0..0..0..0..0..1. .0..1..1..1..1..1..1
..0..1..1..1..1..1..0. .0..1..1..0..0..0..0. .1..0..0..1..1..1..0
..0..1..1..0..1..1..0. .0..1..0..0..1..0..1. .1..0..1..1..0..1..1

Crossrefs

Cf. A317863.

Sequence in context: A229452 A199816 A302870 * A318551 A307461 A318213

Adjacent sequences: A317859 A317860 A317861 * A317863 A317864 A317865

Keyword

nonn

Author

R. H. Hardin, Aug 09 2018

Status

approved