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

1,1

Comments

Column 2 of A203564

Links

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

Example

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

Crossrefs

Sequence in context: A228977 A223576 A125824 * A223653 A351929 A238912

Adjacent sequences: A203555 A203556 A203557 * A203559 A203560 A203561

Keyword

nonn

Author

R. H. Hardin Jan 03 2012

Status

approved