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A119601
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a(n) = 4*Product_{i=1..2n-1} (3^i+1)^2.
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0
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4, 64, 5017600, 2008645953126400, 5124408580006984170864640000, 85495432669493277396354169745064287272960000, 9355246290649672947599943358541996936410690283965618585600000000, 6716146186611919497047421474121060203152077041964192052138083160878210999543398400000000, 31633930525439354064905560668985964653660262913501499819669450560971550674840773249412865611450669691043840000000000
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OFFSET
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0,1
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LINKS
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PROG
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(PARI) a(n) = 4*prod(i=1, 2*n-1, (3^i+1)^2); \\ Michel Marcus, Oct 28 2015
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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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