A318078 Number of nX4 0..1 arrays with every element unequal to 0, 1, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

5, 7, 11, 22, 34, 64, 132, 280, 556, 1083, 2208, 4480, 9083, 18324, 37073, 74864, 151386, 307006, 622583, 1259310, 2546594, 5156916, 10449815, 21161643, 42837534, 86725499, 175609679, 355607121, 720103580, 1458127803, 2952342256, 5977830149

Offset

1,1

Comments

Column 4 of A318082.

Links

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

Example

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

Crossrefs

Cf. A318082.

Sequence in context: A045441 A128841 A057733 * A174332 A248595 A266233

Adjacent sequences: A318075 A318076 A318077 * A318079 A318080 A318081

Keyword

nonn

Author

R. H. Hardin, Aug 15 2018

Status

approved