A183478 Number of nX4 0..2 arrays with every element equal to either the sum mod 3 of its vertical neighbors or the sum mod 3 of its horizontal neighbors.

7, 135, 587, 4015, 40073, 270549, 1942323, 15984991, 119888365, 894632985, 6977123487, 53362780811, 405255680609, 3117495042837, 23903072796727, 182681815961381, 1400954811635395, 10740879929227211, 82253911392409687

Offset: 1

Author

R. H. Hardin Jan 05 2011

Keywords

• nonn

Comments

Column 4 of A183483

Examples

			Some solutions for 6X4
..0..0..0..0....0..0..1..1....0..0..0..0....0..2..1..0....0..0..0..0
..2..2..0..2....1..0..1..1....1..2..0..0....0..2..1..0....0..0..1..1
..0..0..0..2....1..0..0..0....1..2..0..0....0..0..0..0....0..0..1..1
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..1..1....0..0..0..0
..0..0..0..2....2..1..2..2....0..0..0..2....0..0..0..0....1..1..0..1
..1..1..0..2....2..1..2..2....2..2..0..2....1..1..0..0....1..1..0..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..200