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 A202681 Number of nX3 0..3 arrays with row sums equal and column sums equal 1
 4, 16, 340, 832, 6784, 224764, 496276, 4373632, 231072928, 353406676, 3224421556, 280342927660, 274352334052, 2553096089392, 372538530340720, 224184063052672, 2113024132266112, 524189682100412404, 189520876535392852 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 3 of A202686 LINKS R. H. Hardin, Table of n, a(n) for n = 1..67 EXAMPLE Some solutions for n=3 ..0..2..3....0..1..1....2..3..0....2..1..2....3..2..0....2..0..2....2..2..2 ..3..0..2....2..0..0....0..2..3....1..1..3....0..2..3....2..2..0....1..3..2 ..2..3..0....0..1..1....3..0..2....2..3..0....2..1..2....0..2..2....3..1..2 CROSSREFS Sequence in context: A014731 A023114 A207851 * A067211 A156337 A000874 Adjacent sequences:  A202678 A202679 A202680 * A202682 A202683 A202684 KEYWORD nonn AUTHOR R. H. Hardin Dec 22 2011 STATUS approved

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