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A174212
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Ultradoublefactorials: a(n) = (n!!)^(n!!).
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0
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OFFSET
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0,3
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COMMENTS
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LINKS
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FORMULA
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EXAMPLE
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For n=4 the doublefactorial is n!! = 4*2 = 8 and a(n) = n!!^n!! = 8^8 = 16777216.
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MAPLE
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P:=proc(i) local a, n; for n from 0 by 1 to i do print(doublefactorial(n)^doublefactorial(n)); od; end: P(10);
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MATHEMATICA
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udf[n_]:=Module[{c=n!!}, c^c]; Array[udf, 7, 0] (* Harvey P. Dale, Aug 17 2017 *)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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