A302148 Number of nX6 0..1 arrays with every element equal to 0, 2, 3 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

1, 6, 34, 255, 2005, 15999, 128319, 1030709, 8283143, 66576711, 535145269, 4301582207, 34576983087, 277937230517, 2234120533079, 17958355078007, 144353239501301, 1160343364887311, 9327097456058015, 74973279259758837

Offset: 1

Author

R. H. Hardin, Apr 02 2018

Keywords

• nonn

Comments

Column 6 of A302150.

Examples

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

Links

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

Crossrefs

Cf. A302150.

Formula

Empirical: a(n) = 13*a(n-1) -44*a(n-2) +25*a(n-3) +71*a(n-4) -44*a(n-5) -36*a(n-6) +16*a(n-7) for n>9