a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+2), with T given by A026120.
A027324
a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+2), with T given by A026120.
Terms
- a(0) =3a(1) =24a(2) =184a(3) =1463a(4) =11657a(5) =93688a(6) =757850a(7) =6169613a(8) =50514395a(9) =415759614a(10) =3438158946a(11) =28554806794a(12) =238086163616
External references
- oeis: A027324