a(n) = n! * Sum_{k=0..n} binomial(2*n-3,k)/(n-k)!.
A380491
a(n) = n! * Sum_{k=0..n} binomial(2*n-3,k)/(n-k)!.
Terms
- a(0) =1a(1) =0a(2) =3a(3) =34a(4) =501a(5) =9276a(6) =207775a(7) =5470158a(8) =165625929a(9) =5671386136a(10) =216730118331
External references
- oeis: A380491