a(n) = 1 + 2 * Sum_{k=0..n-1} binomial(n-1,k) * a(k) * a(n-k-1).
A345104
a(n) = 1 + 2 * Sum_{k=0..n-1} binomial(n-1,k) * a(k) * a(n-k-1).
Terms
- a(0) =1a(1) =3a(2) =13a(3) =89a(4) =825a(5) =9601a(6) =134185a(7) =2188353a(8) =40788745a(9) =855303265a(10) =19927758377a(11) =510728051073
External references
- oeis: A345104