A183681 Number of (n+1)X(n+1) binary arrays with every 2X2 subblock nonsingular.

6, 32, 256, 3472, 73344, 2542368, 140090240, 12503757968, 1787244586880, 411927241028352, 152442345546739968, 90819596095626887104, 86960426240537811217920, 133963874202574308172821152

Offset: 1

Author

R. H. Hardin Jan 06 2011

Keywords

• nonn

Comments

Diagonal of A183688

Examples

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

Links

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