A206465 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having zero permanent.

25, 1411, 110889, 68352739, 61244865529, 377599682448675, 3848918441303655721, 232902549300945882026755, 26631802795003317433250214201, 15822211869785299795988010016362883

Offset: 1

Author

R. H. Hardin Feb 08 2012

Keywords

• nonn

Comments

Diagonal of A206472

Examples

			Some solutions for n=4
..0..0..0..2..0....2..1..0..2..1....1..2..1..0..1....1..2..2..2..1
..0..1..0..1..0....0..0..0..0..0....0..0..0..0..1....0..0..0..0..0
..0..0..0..1..0....1..0..0..2..0....2..1..2..0..1....0..1..0..0..2
..0..2..0..0..0....0..0..0..0..0....0..0..0..0..2....0..0..0..0..1
..0..1..0..0..0....1..2..0..1..2....1..2..2..0..1....1..1..2..0..2
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..18