a(n) = Sum_{k=0..n-1} binomial(2*n,2*k)*a(k)*a(n-k-1).
A002067
a(n) = Sum_{k=0..n-1} binomial(2*n,2*k)*a(k)*a(n-k-1).
Terms
- a(0) =1a(1) =1a(2) =7a(3) =127a(4) =4369a(5) =243649a(6) =20036983a(7) =2280356863a(8) =343141433761
External references
- oeis: A002067