A209586 Number of n X n 0..1 arrays with every element equal to a diagonal or antidiagonal reflection.

2, 16, 192, 9216, 663552, 191102976, 82556485632, 142657607172096, 369768517790072832, 3833759992447475122176, 59622635402543133100081152, 3709004903121403223889848303616, 346094665520064377627609524907016192

Offset: 1

Author

R. H. Hardin Mar 10 2012

Keywords

• nonn

Comments

Column 1 of A209593

Examples

			Some solutions for n=3
..0..1..0....1..0..0....1..0..0....1..1..1....0..0..1....0..0..0....1..1..1
..1..1..0....0..0..0....0..0..0....0..1..1....1..0..0....1..1..0....0..1..1
..0..0..1....1..0..0....0..0..1....1..0..1....0..1..0....0..1..0....1..0..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..30

Formula

a(n) = 2 ^ (2*n-(n modulo 2)) * 6 ^ ((n*n-2*n+(n modulo 2))/4)