A301788 Number of nX6 0..1 arrays with every element equal to 0 or 1 horizontally or antidiagonally adjacent elements, with upper left element zero.

13, 22, 38, 66, 116, 205, 364, 648, 1156, 2065, 3692, 6605, 11821, 21162, 37891, 67853, 121517, 217635, 389795, 698159, 1250488, 2239801, 4011830, 7185843, 12871061, 23054299, 41294302, 73965426, 132485296, 237304945, 425055875, 761351738

Offset: 1

Author

R. H. Hardin, Mar 26 2018

Keywords

• nonn

Comments

Column 6 of A301790.

Examples

			Some solutions for n=5
..0..1..1..0..1..0. .0..0..1..0..0..1. .0..1..0..1..0..1. .0..1..0..1..0..0
..0..0..1..0..1..0. .1..0..1..1..0..1. .1..0..1..0..1..0. .0..1..0..1..1..0
..1..0..1..0..1..0. .1..0..0..1..0..1. .1..0..1..0..1..1. .0..1..0..0..1..0
..1..0..1..0..1..0. .1..1..0..1..0..0. .1..0..1..0..0..1. .0..1..1..0..1..1
..0..1..0..1..0..1. .0..1..0..1..1..0. .1..0..1..1..0..0. .0..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) = a(n-1) +2*a(n-2) -a(n-4) -a(n-5) -a(n-6)