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A134370
a(n) = ((2n+1)!)^(n+2).
5
1, 216, 207360000, 3252016064102400000, 2283380023591730815784976384000000, 161469323688736156802100136913438716723200000000000000, 2260697901194635682690248130915498742378267539496871953338204160000000000000000
OFFSET
0,2
FORMULA
a(n) ~ 2^(2*(n+1)*(n+2)) * exp(13/24 - 2*n*(n+2)) * n^((n+2)*(4*n+3)/2) * Pi^(n/2 + 1). - Vaclav Kotesovec, Oct 26 2017
MATHEMATICA
Table[((2n+1)!)^(n + 2), {n, 0, 10}]
KEYWORD
nonn
AUTHOR
Artur Jasinski, Oct 22 2007
EXTENSIONS
Typo in a(6) corrected by Georg Fischer, Apr 10 2024
STATUS
approved