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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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Last modified July 25 06:42 EDT 2017. Contains 289779 sequences.