A134371 a(n) = ((2n)!)^n.

1, 2, 576, 373248000, 2642908293365760000, 629238322197897601351680000000000, 12078744213598964456884373878200091017216000000000000

Offset: 0

Author

Artur Jasinski, Oct 22 2007

Keywords

• nonn

Crossrefs

Cf. A000142, A001044, A000442, A036740, A134366, A134367, A134368, A134369, A134370, A134374, A134375.

Programs

Mathematica

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

Formula

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