A303416 Number of n X 3 0..1 arrays with every element equal to 0, 1, 2, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

4, 32, 252, 1988, 15684, 123732, 976132, 7700788, 60752164, 479278932, 3781071812, 29829193588, 235325017444, 1856498858132, 14646075660292, 115544122910388, 911537305199524, 7191194479141332, 56731938168469572, 447563032495731188

Offset: 1

Author

R. H. Hardin, Apr 23 2018

Keywords

• nonn

Comments

Column 3 of A303421.

Examples

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

Links

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

Crossrefs

Cf. A303421.

Formula

Empirical: a(n) = 7*a(n-1) +6*a(n-2) +8*a(n-3).