A318087 Number of nX4 0..1 arrays with every element unequal to 0, 2, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

1, 3, 7, 47, 159, 547, 1976, 8031, 32040, 126847, 497430, 1956777, 7702762, 30347033, 119531416, 470732127, 1853881221, 7300825094, 28753367787, 113237861964, 445967783236, 1756341155437, 6916999603444, 27241103834694, 107283461298615

Offset

1,2

Comments

Column 4 of A318091.

Links

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

Example

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

Crossrefs

Cf. A318091.

Sequence in context: A263806 A074714 A064457 * A005650 A020754 A052381

Adjacent sequences: A318084 A318085 A318086 * A318088 A318089 A318090

Keyword

nonn

Author

R. H. Hardin, Aug 16 2018

Status

approved