A209587 Number of n X n 0..2 arrays with every element equal to a diagonal or antidiagonal reflection.

3, 81, 3645, 1476225, 996451875, 6053445140625, 61291132048828125, 5585154407949462890625, 848245325707324676513671875, 1159445329576199417209625244140625

Offset: 1

Author

R. H. Hardin Mar 10 2012

Keywords

• nonn

Comments

Column 2 of A209593

Examples

			Some solutions for n=3
..1..1..1....2..0..1....0..1..1....2..0..2....2..0..0....0..2..1....0..2..0
..1..2..2....0..1..2....1..2..1....2..1..0....0..0..0....2..1..0....1..1..2
..0..2..0....1..2..0....0..1..2....1..2..0....0..0..1....1..0..2....0..1..2
		

Links

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

Formula

a(n) = 3 ^ (2*n-(n modulo 2)) * 15 ^ ((n*n-2*n+(n modulo 2))/4)