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A112311
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a(1)=1, a(2)=2, a(3)=9; a(n) = n*(n - 2)*a(n - 1)^2/(n - 1).
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1
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1, 2, 9, 216, 174960, 146932807680, 125937291507579224064000, 108755666689817047890109782510255885778944000000, 93143885917529328515023382841413836868525118214478405334515136630707122998865821696000000000000
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