a(n) = Sum_{k=0..2*n-3} T(n,k) * T(n,k+3), with T given by A026584.
A027285
a(n) = Sum_{k=0..2*n-3} T(n,k) * T(n,k+3), with T given by A026584.
Terms
- a(0) =12a(1) =116a(2) =682a(3) =4908a(4) =30272a(5) =201648a(6) =1273286a(7) =8275894a(8) =52783298a(9) =340392020a(10) =2180905198a(11) =14035736838a(12) =90149817980a(13) =580197442656
External references
- oeis: A027285