OFFSET
0,2
EXAMPLE
For n = 2, a(n) = (2^n)! / n! = (2^2)! / 2! = 12.
MATHEMATICA
Table[(2^n)!/n!, {n, 0, 6}] (* Michael De Vlieger, Sep 09 2015 *)
PROG
(PARI) a(n) = (2^n)! / n!;
vector(10, n, a(n-1))
(Magma) [Factorial(2^n) / Factorial(n): n in [0..7]]; // Vincenzo Librandi, Sep 10 2015
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Altug Alkan, Sep 08 2015
STATUS
approved