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A200149
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Number of 0..3 arrays x(0..n-1) of n elements with zero n-1st difference
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0
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1, 4, 8, 22, 40, 112, 182, 688, 844, 2090, 2478, 21056, 20762, 112864, 113870, 204796, 141246, 2255872, 1610768, 18946704, 15066098, 20640826, 12378248, 332333696, 279217826, 531539936, 618937930, 1715570198, 330283576, 20131457680
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=6
..0....1....3....0....3....3....0....2....0....1....0....1....3....3....2....2
..3....3....1....2....3....3....2....3....3....2....3....3....3....2....3....0
..3....2....1....3....1....3....0....1....1....3....0....3....1....1....0....2
..2....2....2....2....1....2....0....1....0....3....0....3....0....0....0....3
..1....3....3....0....3....1....2....3....1....2....3....3....1....0....3....2
..0....1....3....0....3....3....0....2....0....1....0....1....3....3....2....2
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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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