A302230 Number of 7Xn 0..1 arrays with every element equal to 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

0, 1172, 9819, 105585, 2043848, 32181643, 553097760, 9458629708, 156841573045, 2693021176397, 45330956689241, 767899918791607, 13034126338915675, 220281663367352676, 3736908224173762193, 63270418755935977976

Offset

1,2

Comments

Row 7 of A302224.

Links

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

Example

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

Crossrefs

Cf. A302224.

Sequence in context: A225234 A253508 A235206 * A302673 A230706 A302477

Adjacent sequences: A302227 A302228 A302229 * A302231 A302232 A302233

Keyword

nonn

Author

R. H. Hardin, Apr 03 2018

Status

approved