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A203487
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Number of nX4 0..2 arrays with row sums equal and column sums unequal to adjacent columns
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1
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24, 556, 9540, 173860, 3065704, 56438584, 1004305424, 18465834580, 335571341040, 6219202151476, 114039550489064, 2121345108007408, 39325546973748384, 735898709559550484, 13729000925046178840, 257888578347427756340
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=5
..0..0..1..2....1..1..2..2....1..1..1..1....2..2..2..0....2..1..1..0
..2..0..0..1....2..1..2..1....1..0..1..2....0..2..2..2....2..2..0..0
..2..0..0..1....2..1..2..1....2..1..0..1....0..2..2..2....0..1..2..1
..1..0..0..2....1..1..2..2....1..0..2..1....0..2..2..2....0..1..2..1
..2..0..0..1....1..1..2..2....1..0..1..2....1..1..2..2....2..0..2..0
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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