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A024188
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((n+2)!/2)(1/3 - 1/4 + ... + c/(n+2)), where c = (-1)^(n+1).
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1
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1, 1, 17, 42, 654, 2712, 44568, 264240, 4721040, 36694080, 716523840, 6917823360, 147356496000, 1703866752000, 39427129728000
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