A318548 Number of nX4 0..1 arrays with every element unequal to 1, 2, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

2, 10, 21, 64, 219, 589, 1782, 5621, 17333, 54199, 169770, 532625, 1674674, 5267287, 16571936, 52167148, 164217643, 517100360, 1628230629, 5127481455, 16147257228, 50851033975, 160145034188, 504341598687, 1588336701913, 5002186675765

Offset

1,1

Comments

Column 4 of A318552.

Links

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

Example

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

Crossrefs

Cf. A318552.

Sequence in context: A296555 A231376 A304700 * A318210 A080881 A138298

Adjacent sequences: A318545 A318546 A318547 * A318549 A318550 A318551

Keyword

nonn

Author

R. H. Hardin, Aug 28 2018

Status

approved