A301612 Number of nX5 0..1 arrays with every element equal to 1, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.

3, 111, 2131, 40085, 758338, 14345706, 271301458, 5131197358, 97045266159, 1835413254015, 34712996298775, 656524254453280, 12416789603607923, 234837748693978527, 4441467446525879000, 84001117092821240904

Offset: 1

Author

R. H. Hardin, Mar 24 2018

Keywords

• nonn

Comments

Column 5 of A301615.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 68

Crossrefs

Cf. A301615.

Formula

Empirical recurrence of order 68 (see link above)