A100043 a(n) = (3*n-1)!.

2, 120, 40320, 39916800, 87178291200, 355687428096000, 2432902008176640000, 25852016738884976640000, 403291461126605635584000000, 8841761993739701954543616000000, 263130836933693530167218012160000000

Offset: 1

Author

Jorge Coveiro, Dec 26 2004

Keywords

• nonn

Programs

Maple

seq( (3*n-1)!,n=1..13);

Sage

[stirling_number1(3*n,1) for n in range(1, 22)] # Zerinvary Lajos, Nov 26 2009