A318087 - OEIS

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

(list; graph; refs; listen; history; text; internal format)

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