A134369 a(n) = ((2n+1)!)^(n+1).

1, 36, 1728000, 645241282560000, 6292383221978976013516800000, 4045146997974190235742848547815424000000000000, 363046466970952735968096996065196818096105852014637875200000000000000

Offset: 0

Author

Artur Jasinski, Oct 22 2007

Keywords

• nonn

Crossrefs

Cf. A000142, A001044, A000442, A036740, A134366, A134367, A134368, A134370, A134371, A134374, A134375.

Programs

Mathematica

Table[((2n+1)!)^(n + 1), {n, 0, 10}]

Formula

a(n) ~ 2^(2*(n+1)^2) * exp(13/24 - 2*n*(n+1)) * n^((n+1)*(4*n+3)/2) * Pi^((n+1)/2). - Vaclav Kotesovec, Oct 26 2017