a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+3), with T given by A026120.
A027325
a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+3), with T given by A026120.
Terms
- a(0) =10a(1) =92a(2) =800a(3) =6850a(4) =58120a(5) =491244a(6) =4145904a(7) =34988117a(8) =295493922a(9) =2498651947a(10) =21159423668a(11) =179473434959
External references
- oeis: A027325