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 A307031 n to the power n double factorial, n^(n!!). 0
 1, 4, 27, 65536, 30517578125, 22452257707354557240087211123792674816, 54361846697263307560529495055267343940077014163990039113495978834700158362117849904436807 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The next term -- a(8) -- has 347 digits. - Harvey P. Dale, Aug 11 2021 LINKS Table of n, a(n) for n=1..7. Eric Weisstein's World of Mathematics, Double Factorial FORMULA a(n) = n^(n!!). MATHEMATICA Table[n^n!!, {n, 7}] (* Harvey P. Dale, Aug 11 2021 *) PROG (Python) def doublefactorial(n): if n <= 0: return 1 else: return n * doublefactorial(n-2) for n in range(1, m): print(n**doublefactorial(n)) CROSSREFS Cf. A254866, A053986. Sequence in context: A292968 A000869 A132640 * A306823 A174212 A352838 Adjacent sequences: A307028 A307029 A307030 * A307032 A307033 A307034 KEYWORD nonn AUTHOR Mark Stander, Mar 20 2019 STATUS approved

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Last modified April 19 21:09 EDT 2024. Contains 371798 sequences. (Running on oeis4.)