a(n) = Sum_{k=0..n} (k+1)^2*T(n,k)^2 where T(n,k) is the Catalan triangle A039598.
A228329
a(n) = Sum_{k=0..n} (k+1)^2*T(n,k)^2 where T(n,k) is the Catalan triangle A039598.
Terms
- a(0) =1a(1) =8a(2) =98a(3) =1320a(4) =18590a(5) =268736a(6) =3952228a(7) =58837680a(8) =883941750a(9) =13373883600a(10) =203487733020
External references
- oeis: A228329