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A053508
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binomial(n-1,3)*n^(n-4).
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1
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0, 0, 0, 1, 20, 360, 6860, 143360, 3306744, 84000000, 2338460520, 70946979840, 2332989862060, 82726831323136, 3148511132812500, 128071114403348480, 5546563698427324720, 254873089955815096320, 12387799656377835411984
(list; graph; refs; listen; history; internal format)
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