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 A203026 Number of nX2 0..3 arrays with row sums equal and column sums unequal to adjacent columns 1
 12, 28, 120, 356, 1472, 4780, 20228, 68724, 296256, 1034008, 4501388, 15995228, 69888012, 251506724, 1098929960, 3991711796, 17408141792, 63681484600, 276945484748, 1018750420536, 4416760710356, 16320495059248, 70538020856288 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A203031 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 EXAMPLE Some.solutions.for.n=5 ..3..0....3..0....2..2....3..0....0..1....3..2....3..0....1..2....0..1....1..0 ..1..2....3..0....1..3....1..2....1..0....2..3....2..1....2..1....0..1....0..1 ..3..0....3..0....1..3....1..2....1..0....3..2....3..0....3..0....1..0....0..1 ..0..3....0..3....1..3....3..0....0..1....2..3....2..1....3..0....0..1....1..0 ..2..1....2..1....2..2....1..2....0..1....2..3....3..0....0..3....0..1....0..1 CROSSREFS Sequence in context: A043969 A204386 A078441 * A189539 A000546 A130516 Adjacent sequences:  A203023 A203024 A203025 * A203027 A203028 A203029 KEYWORD nonn AUTHOR R. H. Hardin Dec 27 2011 STATUS approved

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