a(n) = sqrt(Pi/4)*2^A048881(2*n)*L(2*n) where L(s) = lim_{t->s} (t/2)!/((1-t)/2)!.
A333306
a(n) = sqrt(Pi/4)*2^A048881(2*n)*L(2*n) where L(s) = lim_{t->s} (t/2)!/((1-t)/2)!.
Terms
- a(0) =1a(1) =1a(2) =-1a(3) =9a(4) =-45a(5) =1575a(6) =-42525a(7) =3274425a(8) =-42567525a(9) =5746615875a(10) =-488462349375
External references
- oeis: A333306