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Search: id:A123022
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A123022 a(n)=n!*b(n) where b(0)=b(1)=1, b(n)=(n-4)b(n-2)/[n(n-1)] for n>=2. +0
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1, 1, -2, -1, 0, -1, 0, -3, 0, -15, 0, -105, 0, -945, 0, -10395, 0, -135135, 0, -2027025, 0, -34459425, 0, -654729075, 0, -13749310575, 0, -316234143225, 0, -7905853580625, 0, -213458046676875, 0, -6190283353629375, 0, -191898783962510625, 0, -6332659870762850625, 0 (list; graph; listen)
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Last modified December 18 21:37 EST 2009. Contains 171024 sequences.

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