a(n) = Sum_{k=0..2n-3} T(n,k) * T(n,k+3), with T given by A026552.
A027275
a(n) = Sum_{k=0..2n-3} T(n,k) * T(n,k+3), with T given by A026552.
Terms
- a(0) =24a(1) =232a(2) =954a(3) =8560a(4) =33648a(5) =297940a(6) =1159844a(7) =10242416a(8) =39809076a(9) =351561242a(10) =1367463642a(11) =12086555584a(12) =47082494816a(13) =416589513644
External references
- oeis: A027275