A202680 Number of nX2 0..3 arrays with row sums equal and column sums equal

4, 16, 16, 96, 104, 904, 788, 10448, 6280, 134716, 51308, 1853064, 425884, 26527440, 3575216, 389480016, 30269864, 5813357404, 257993708, 87736873196, 2210701460, 1334461492996, 19026456248, 20412201535352, 164353672604, 313578887333104

Offset

1,1

Comments

Column 2 of A202686

Links

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

Example

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

Crossrefs

Sequence in context: A267997 A229105 A223585 * A263568 A009570 A232839

Adjacent sequences: A202677 A202678 A202679 * A202681 A202682 A202683

Keyword

nonn

Author

R. H. Hardin Dec 22 2011

Status

approved