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A203558
Number of nX2 0..2 arrays with row sums equal and column sums equal
1
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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 03 2012
STATUS
approved