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A325051
a(n) = Product_{i=0..n, j=0..n, k=0..n} (i!*j!*k! + 1).
1
2, 256, 19131876000000, 20879156515576282948808247752954619590255260568062500000000
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OFFSET
0,1
COMMENTS
Next term is too long to be included.
LINKS
Table of n, a(n) for n=0..3.
FORMULA
a(n) ~ c * (2*Pi)^(3*n^3/2 + 9*n^2/2 + 9*n/2 + 3/2) * n^((n+1)^2*(6*n^2 + 12*n + 5)/4) / (A^(3*(n+1)^2) * exp(9*n^4/4 + 15*n^3/2 + 8*n^2 + 9*n/4 - 59/80)), where A is the Glaisher-Kinkelin constant
A074962
and c = Product_{i>=0, j>=0, k>=0} (1 + 1/(i!*j!*k!)) = 10013049.64089403856780758322163675337812476527762657951330...
MATHEMATICA
Table[Product[i!*j!*k! + 1, {i, 0, n}, {j, 0, n}, {k, 0, n}], {n, 0, 5}]
Table[BarnesG[n+2]^(3*(n+1)^2) * Product[1 + 1/(i!*j!*k!), {i, 0, n}, {j, 0, n}, {k, 0, n}], {n, 0, 5}]
CROSSREFS
Cf.
A306907
,
A325049
.
Sequence in context:
A067480
A062077
A190539
*
A240551
A078168
A003380
Adjacent sequences:
A325048
A325049
A325050
*
A325052
A325053
A325054
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec
, Mar 26 2019
STATUS
approved
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Last modified April 25 10:51 EDT 2024. Contains 371967 sequences. (Running on oeis4.)