A203538 Number of nX4 0..2 arrays with every element neighboring horizontally or vertically both a 0 and a 1.

0, 16, 144, 3364, 30976, 614656, 8479744, 129504400, 1978826256, 29961532836, 454089995044, 6895434839056, 104626058201344, 1587468792674704, 24091008317030656, 365573436678862864, 5547427717263648804

Offset: 1

Author

R. H. Hardin Jan 02 2012

Keywords

• nonn

Comments

Column 4 of A203542

Examples

			Some solutions for n=5
..0..0..0..1....2..0..0..1....1..0..0..1....2..1..0..2....2..1..0..1
..1..1..0..1....1..1..0..1....1..0..2..1....0..1..0..1....0..1..0..1
..0..0..2..2....0..1..2..1....1..2..0..0....0..2..1..1....0..0..2..2
..0..0..1..0....0..0..2..0....0..2..1..0....1..0..1..0....1..0..1..0
..1..1..1..0....1..1..1..0....0..1..1..0....1..0..1..0....1..0..1..0
		

Links

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