A203558 Number of nX2 0..2 arrays with row sums equal and column sums equal.

3, 9, 9, 33, 53, 183, 395, 1249, 3141, 9459, 25655, 75639, 212943, 623093, 1787609, 5222369, 15134933, 44250051, 128996855, 377748883, 1105350731, 3242546393, 9513228125, 27953744695, 82176836303, 241834027353, 712070156205

Offset: 1

Author

R. H. Hardin Jan 03 2012

Keywords

• nonn

Comments

Column 2 of A203564

Examples

			Some solutions for n=5
..1..1....2..2....2..0....2..2....0..0....1..1....1..1....2..0....0..0....2..2
..1..1....2..2....1..1....2..2....0..0....0..2....0..2....1..1....0..0....2..2
..2..0....2..2....1..1....2..2....0..0....2..0....2..0....2..0....0..0....2..2
..1..1....2..2....1..1....2..2....0..0....2..0....0..2....0..2....0..0....2..2
..0..2....2..2....0..2....2..2....0..0....0..2....2..0....0..2....0..0....2..2
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210