A183321 Number of nX9 binary arrays with an element zero only if there are an even number of ones to its left and an even number of ones above it.

89, 1097, 28959, 498825, 10288475, 190243099, 3674032121, 68795107993, 1301324910599, 24374459510955, 457521652409443, 8556633331945529, 160077250226203655, 2989991870865523923, 55846494235069318769

Offset: 1

Author

R. H. Hardin Jan 03 2011

Keywords

• nonn

Comments

Column 9 of A183322

Examples

			Some solutions for 5X9
..0..1..1..0..0..0..0..0..0....0..0..0..0..0..0..0..0..0
..0..1..1..0..0..0..0..0..0....0..0..0..0..0..0..0..0..0
..0..0..0..0..0..0..1..1..0....1..1..1..1..0..0..1..1..1
..0..0..0..0..1..1..1..1..1....1..1..1..1..0..0..1..1..1
..0..1..1..0..1..1..1..1..1....0..0..0..1..1..0..0..0..0
		

Links

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