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A202680
Number of nX2 0..3 arrays with row sums equal and column sums equal
1
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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 22 2011
STATUS
approved