A134368 a(n) = ((2n)!)^(n+1).

1, 4, 13824, 268738560000, 106562062388507443200000, 2283380023591730815784976384000000000000, 5785737804304645733190746102656048717392091545600000000000000

Offset: 0

Author

Artur Jasinski, Oct 22 2007

Keywords

• nonn

Crossrefs

Cf. A000142, A001044, A000442, A036740, A134367, A134368, A134369, A134370, A134371, A134374, A134375.

Programs

Mathematica

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

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