A184558 Number of (n+1)X4 0..2 arrays with no 2X2 subblock summing to less than 4.

2167, 91157, 3436266, 134840527, 5228522011, 203570564774, 7915660174974, 307926979784837, 11976979258313503, 465872448754593695, 18120917050387510050, 704848019543121767190, 27416378429106168358674

Offset: 1

Author

R. H. Hardin Jan 17 2011

Keywords

• nonn

Comments

Column 3 of A184564

Examples

			Some solutions for 3X4
..2..0..2..2....2..2..2..0....1..1..1..2....0..1..1..0....1..2..1..1
..2..2..2..0....1..2..0..2....2..2..2..1....2..2..2..1....2..2..2..0
..1..0..1..1....1..2..2..2....1..1..0..1....2..1..0..1....1..2..1..2
		

Links

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