a(n) = Sum_{k=0..2n-3} T(n,k) * T(n,k+3), with T given by A027052.
A027081
a(n) = Sum_{k=0..2n-3} T(n,k) * T(n,k+3), with T given by A027052.
Terms
- a(0) =8a(1) =56a(2) =438a(3) =3574a(4) =29738a(5) =249200a(6) =2094902a(7) =17648718a(8) =148968822a(9) =1259807224a(10) =10674450652a(11) =90618393250a(12) =770728674864
External references
- oeis: A027081