Question 699385
a(n) = (n+1)!/2n
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a(1) = 2!/2 = 2/2 = 1
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a(2) = 3!/4 = 6/4 = 3/2
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a(3) = 4!/6 = 12/6 = 2
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a(4) = 5!/8 = 120/8 = 15
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a(5) = 6!/12 = 60
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Cheers,
Stan H.
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