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A127610
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Floor(( (n+1)/2 )^n)-n!.
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0
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0, 0, 0, 2, 15, 123, 1118, 11344, 127831, 1590245, 21700716, 322880256, 5209007463, 90661989607, 1694616510154, 33876697720832, 721588072472639, 16321494271570569, 390811944752490542, 9878354899591168000, 262896868506265373394, 7349159002086450661211
(list; graph; refs; listen; history; internal format)
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