A203541 Number of nX7 0..2 arrays with every element neighboring horizontally or vertically both a 0 and a 1.

0, 676, 69920, 8479744, 1680210240, 257720706244, 44312000955508, 7260263864381124, 1226995111990493792, 204147560099024833600, 34127708705716358062368, 5703975087798515553780804

Offset: 1

Author

R. H. Hardin Jan 02 2012

Keywords

• nonn

Comments

Column 7 of A203542

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..16