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A277352
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a(n) = Product_{k=1..n} (2*k^2+1).
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2
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1, 3, 27, 513, 16929, 863379, 63026667, 6239640033, 804913564257, 131200910973891, 26371383105752091, 6408246094697758113, 1851983121367652094657, 627822278143634060088723, 246734155310448185614868139, 111277104045012131712305530689
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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a(n) ~ 2^(n+3/2) * n^(2*n+1) * sinh(Pi/sqrt(2)) / exp(2*n).
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MATHEMATICA
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Table[Product[2*k^2+1, {k, 1, n}], {n, 0, 15}]
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PROG
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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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