[vladd@Kenga] [13:17:13] [~]
{0,231}$> bc -l
bc 1.06
Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty'.
define f(n) { return sqrt(2*3.14159*n) / 8 * n * l(n) / l(2) * (n / e(1))^n / 2^30; }
f(10)
.01391698959287035691
f(12)
2.38230602935217311090
f(15)
8871.96233918242198108428
f(17)
2863205.79614441669956897669