A318021 Number of nX5 0..1 arrays with every element unequal to 0, 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

16, 95, 419, 2227, 12039, 60157, 304184, 1569163, 8067785, 41794215, 216350270, 1121920799, 5819644170, 30203030342, 156774826962, 813943024542, 4226109266686, 21944484821348, 113952475164535, 591748572069652

Offset

1,1

Comments

Column 5 of A318024.

Links

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

Example

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

Crossrefs

Cf. A318024.

Sequence in context: A379569 A159245 A066487 * A333511 A320406 A241936

Adjacent sequences: A318018 A318019 A318020 * A318022 A318023 A318024

Keyword

nonn

Author

R. H. Hardin, Aug 12 2018

Status

approved