a(n) = Sum_{k=0..n} T(n,k) * T(n,n+k), with T given by A027082.
A027109
a(n) = Sum_{k=0..n} T(n,k) * T(n,n+k), with T given by A027082.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =29a(4) =131a(5) =619a(6) =3013a(7) =14854a(8) =73996a(9) =372023a(10) =1883369a(11) =9591012a(12) =49091034a(13) =252371780a(14) =1302419484a(15) =6744389329a(16) =35031370911a(17) =182457629783a(18) =952674694705
External references
- oeis: A027109