A184754 Half the number of n X n binary arrays with no 1 having an adjacent 1 both above and to its left.

1, 7, 163, 12397, 3110914, 2568513843, 6982256142285, 62483420093901107, 1840782554883258104105, 178527915853668578288219231, 57000185549334885919706636039360, 59911857895558455825087768017439269698

Offset: 1

Author

R. H. Hardin Jan 21 2011

Keywords

• nonn

Comments

Diagonal of A184761

Examples

			Some solutions for 3X3
..1..1..0....1..1..1....1..1..0....1..0..1....1..0..1....0..0..1....0..1..1
..0..1..0....1..0..1....0..1..1....1..1..0....1..0..1....0..0..0....1..0..1
..0..1..0....1..1..0....1..0..0....0..0..0....1..0..0....1..1..0....0..0..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..19