a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026300.
A026941
a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026300.
Terms
- a(0) =2a(1) =17a(2) =138a(3) =1084a(4) =8527a(5) =67409a(6) =536843a(7) =4307147a(8) =34801715a(9) =283030274a(10) =2315438399a(11) =19044040677a(12) =157394654650
External references
- oeis: A026941