A204706 Number of (n+1)X(n+1) 0..1 arrays with the permanents of all 2X2 subblocks equal and nonzero.

7, 33, 257, 3473, 73345, 2542369, 140090241, 12503757969, 1787244586881, 411927241028353, 152442345546739969, 90819596095626887105, 86960426240537811217921, 133963874202574308172821153

Offset: 1

Author

R. H. Hardin Jan 18 2012

Keywords

• nonn

Comments

Diagonal of A204713

Examples

			Some solutions for n=4
..0..1..0..1..1....0..1..0..1..1....1..0..1..1..1....0..1..0..1..0
..1..0..1..1..0....1..1..1..0..1....0..1..1..0..1....1..0..1..1..1
..1..1..0..1..1....0..1..0..1..0....1..1..0..1..0....0..1..0..1..0
..0..1..1..1..0....1..1..1..1..1....1..0..1..1..1....1..1..1..1..1
..1..0..1..0..1....1..0..1..0..1....0..1..1..0..1....0..1..0..1..0
		

Links

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