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A000308
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a(n) = a(n-1)*a(n-2)*a(n-3) with a(1)=1, a(2)=2 and a(3)=3.
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4
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1, 2, 3, 6, 36, 648, 139968, 3265173504, 296148833645101056, 135345882205792807436868315512832, 130876399105969522361889021452224949874232743897657526714368
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OFFSET
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1,2
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LINKS
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FORMULA
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EXAMPLE
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a(6)=36*6*3=648.
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MAPLE
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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