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A134368
a(n) = ((2n)!)^(n+1).
11
1, 4, 13824, 268738560000, 106562062388507443200000, 2283380023591730815784976384000000000000, 5785737804304645733190746102656048717392091545600000000000000
OFFSET
0,2
FORMULA
a(n) ~ 2^((n+1)*(2*n+1)) * exp(1/24 - 2*n*(n+1)) * n^((n+1)*(4*n+1)/2) * Pi^((n+1)/2). - Vaclav Kotesovec, Oct 26 2017
MATHEMATICA
Table[((2n)!)^(n + 1), {n, 0, 10}]
KEYWORD
nonn
AUTHOR
Artur Jasinski, Oct 22 2007
STATUS
approved