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A180888
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Number of permutations of 0..n-1 with no element greater than or equal to the sum of its neighbors
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0
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1, 0, 0, 0, 8, 24, 80, 504, 4600, 36176, 304888, 2842472, 29790752, 331382672, 3962130640, 50186636768, 680693513480
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OFFSET
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1,5
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LINKS
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EXAMPLE
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All solutions for n=5
(0 1 2 4 3) (0 1 3 4 2) (0 2 4 3 1) (0 3 4 2 1)
(1 2 4 3 0) (1 3 4 2 0) (2 4 3 1 0) (3 4 2 1 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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