A303635 Number of nX7 0..1 arrays with every element unequal to 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.

0, 8, 2, 47, 207, 1417, 7538, 53989, 309136, 2041378, 12561807, 80107485, 503096639, 3184635107, 20059337678, 126810474201, 799559544897, 5050657497454, 31866050738166, 201192109912331, 1269778066786642, 8015596643008521

Offset

1,2

Comments

Column 7 of A303636.

Links

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

Example

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

Crossrefs

Cf. A303636.

Sequence in context: A006708 A355585 A273671 * A179315 A096041 A202625

Adjacent sequences: A303632 A303633 A303634 * A303636 A303637 A303638

Keyword

nonn

Author

R. H. Hardin, Apr 27 2018

Status

approved