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 A255269 a(n) = Product_{k=1..n} k!^k. 8
 1, 4, 864, 286654464, 7132880358604800000, 993710590042385551668019200000000000, 82086865668400428790437436119503664712777728000000000000000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Eric Weisstein's World of Mathematics, Hyperfactorial Eric Weisstein's World of Mathematics, Superfactorial FORMULA a(n) = A255268(n) / A055462(n-1). a(n) ~ sqrt(A) * exp((3 - 45*n^2 - 32*n^3 - 9*Zeta(3)/Pi^2)/72) * n^((8*n^3 + 18*n^2 + 10*n + 1)/24) * (2*Pi)^(n*(n+1)/4), where A = A074962 = 1.28242712910062263687534256886979... is the Glaisher-Kinkelin constant and Zeta(3) = A002117 = 1.2020569031595942853997... . MATHEMATICA Table[Product[k!^k, {k, 1, n}], {n, 1, 10}] CROSSREFS Cf. A000178, A002109, A036740, A055462, A255268. Sequence in context: A176186 A221232 A272167 * A113896 A159706 A188978 Adjacent sequences:  A255266 A255267 A255268 * A255270 A255271 A255272 KEYWORD nonn AUTHOR Vaclav Kotesovec, Feb 20 2015 STATUS approved

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Last modified November 20 13:13 EST 2018. Contains 317402 sequences. (Running on oeis4.)