A371339 a(n) = Product_{k=1..n} A000178(k)^k.

1, 1, 4, 6912, 47552535724032, 2344457420244640062508151026483200000, 556518660278190472985800630083758030134707790620313895060688076800000000000000000

Offset

0,3

Links

Table of n, a(n) for n=0..6.

Eric Weisstein's World of Mathematics, Superfactorial.

Formula

a(n) = Product_{k=1..n} BarnesG(k+2)^k.

a(n) = A372140(n+2) / A055462(n)^2.

a(n) ~ (2*Pi)^(n*(n+1)*(n+2)/6) * n^(n^4/8 + 7*n^3/12 + 5*n^2/6 + 3*n/8 + 19/720) / (A^(n^2/2 + n/2 - 1/3) * exp(7*n^4/32 + 59*n^3/72 + 17*n^2/24 - n/24 + zeta(3)/(8*Pi^2) + zeta'(-3)/6 - 37/720)), where A is the Glaisher-Kinkelin constant A074962, zeta(3) = A002117, zeta'(-3) = A259068.

Mathematica

Table[Product[BarnesG[k+2]^k, {k, 1, n}], {n, 0, 8}]

Crossrefs

Cf. A000178, A055462, A255269, A372140.

Sequence in context: A368807 A077258 A272165 * A304994 A058440 A058464

Adjacent sequences: A371336 A371337 A371338 * A371340 A371341 A371342

Keyword

nonn

Author

Vaclav Kotesovec, Apr 20 2024

Status

approved