A301666 Number of nX5 0..1 arrays with every element equal to 1, 2 or 4 horizontally or vertically adjacent elements, with upper left element zero.

3, 61, 407, 2793, 21224, 146841, 1073621, 7703565, 55506215, 399555430, 2875870497, 20706418377, 149059329261, 1073124611823, 7725565402834, 55617663607353, 400401309675815, 2882556650714509, 20752023117855145

Offset

1,1

Comments

Column 5 of A301669.

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

Crossrefs

Cf. A301669.

Sequence in context: A105430 A141979 A185831 * A102720 A120308 A279381

Adjacent sequences: A301663 A301664 A301665 * A301667 A301668 A301669

Keyword

nonn

Author

R. H. Hardin, Mar 25 2018

Status

approved