A301789 Number of n X 7 0..1 arrays with every element equal to 0 or 1 horizontally or antidiagonally adjacent elements, with upper left element zero.

21, 35, 59, 100, 171, 294, 508, 881, 1532, 2670, 4661, 8147, 14254, 24957, 43721, 76625, 134335, 235566, 413157, 724732, 1271408, 2230625, 3913758, 6867218, 12049871, 21144385, 37103604, 65109365, 114255101, 200498599, 351843723

Offset: 1

Author

R. H. Hardin, Mar 26 2018

Keywords

• nonn

Comments

Column 7 of A301790.

Examples

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

Links

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

Crossrefs

Cf. A301790.

Formula

Empirical: a(n) = 2*a(n-1) -a(n-4) -a(n-6).