Sum of all n-digit Catalan numbers.

Terms

a(0) =9a(1) =56a(2) =561a(3) =6292a(4) =75582a(5) =950912a(6) =12369285a(7) =35357670a(8) =607283490a(9) =8331383610a(10) =115948830660a(11) =343059613650