a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026300.
A026942
a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026300.
Terms
- a(0) =4a(1) =48a(2) =469a(3) =4222a(4) =36715a(5) =313912a(6) =2661888a(7) =22486072a(8) =189688752a(9) =1600198048a(10) =13510004742a(11) =114204762280a(12) =966871825132
External references
- oeis: A026942