A301607 Number of nX7 0..1 arrays with every element equal to 0, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.

1, 21, 55, 755, 6393, 60841, 591585, 5880829, 58383932, 585233819, 5854941545, 58759934077, 589360075403, 5914609427757, 59355963113549, 595731234612875, 5979121155775603, 60011713256358774, 602331412174313879

Offset

1,2

Comments

Column 7 of A301608.

Links

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

Example

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

Crossrefs

Cf. A301608.

Sequence in context: A264104 A236694 A292368 * A145719 A031963 A067727

Adjacent sequences: A301604 A301605 A301606 * A301608 A301609 A301610

Keyword

nonn

Author

R. H. Hardin, Mar 24 2018

Status

approved