A301998 Number of nX7 0..1 arrays with every element equal to 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

8, 128, 1108, 10982, 122232, 1366374, 15243860, 169636124, 1884309898, 20919022400, 232254936138, 2579000358404, 28639373845122, 318037976285038, 3531770886607536, 39219734913406306, 435528277377832336

Offset: 1

Author

R. H. Hardin, Mar 30 2018

Keywords

• nonn

Comments

Column 7 of A301999.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 52

Crossrefs

Cf. A301999.

Formula

Empirical recurrence of order 52 (see link above)