A301668 Number of nX7 0..1 arrays with every element equal to 1, 2 or 4 horizontally or vertically adjacent elements, with upper left element zero.

8, 421, 5289, 71564, 1073621, 15498505, 225780260, 3307561389, 48158543096, 703127937300, 10259186324647, 149696614458243, 2184338617470806, 31873058777880129, 465081902561442941, 6786326832276152384

Offset

1,1

Comments

Column 7 of A301669.

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..0..1..1..0..0..1. .0..0..0..1..1..0..1
..0..1..1..0..0..1..1. .0..1..0..0..1..0..1. .0..1..0..0..1..0..1
..0..0..1..0..1..0..1. .0..1..0..1..1..0..1. .0..1..1..0..1..1..0
..1..0..1..0..1..0..1. .0..1..0..1..0..0..0. .0..0..0..1..0..1..0
..1..1..0..0..1..0..1. .0..1..0..1..1..0..0. .1..1..0..1..0..1..1

Crossrefs

Cf. A301669.

Sequence in context: A193372 A368002 A185833 * A038781 A092868 A038782

Adjacent sequences: A301665 A301666 A301667 * A301669 A301670 A301671

Keyword

nonn

Author

R. H. Hardin, Mar 25 2018

Status

approved