a(n) = (2*n)! * Sum_{k=0..n} binomial(n,k)/(n+k)!.
A082545
a(n) = (2*n)! * Sum_{k=0..n} binomial(n,k)/(n+k)!.
Terms
- a(0) =1a(1) =3a(2) =21a(3) =229a(4) =3393a(5) =63591a(6) =1442173a(7) =38398641a(8) =1174226049a(9) =40558249963
External references
- oeis: A082545