A203559 Number of nX3 0..2 arrays with row sums equal and column sums equal.

3, 9, 87, 177, 993, 10833, 35619, 219873, 2083713, 8710539, 55644339, 473819481, 2320792659, 15120204297, 119105713827, 650725327233, 4293779332929, 32065818855387, 188739799967427, 1256510215733187, 9061494550445907

Offset: 1

Author

R. H. Hardin Jan 03 2012

Keywords

• nonn

Comments

Column 3 of A203564

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..122