A302510 Number of n X 3 0..1 arrays with every element equal to 0, 1, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

3, 3, 11, 9, 14, 21, 28, 37, 51, 72, 100, 137, 188, 260, 360, 497, 685, 945, 1305, 1802, 2487, 3432, 4737, 6539, 9026, 12458, 17195, 23734, 32760, 45218, 62413, 86147, 118907, 164125, 226538, 312685, 431592, 595717, 822255, 1134940, 1566532

Offset: 1

Author

R. H. Hardin, Apr 09 2018

Keywords

• nonn

Examples

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

Links

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

Crossrefs

Column 3 of A302515.

Formula

Empirical: a(n) = a(n-1) +a(n-4) for n>7.