a(n) = Sum_{k=0..floor((n-5)/2)} T(n,k) * T(n,k+1), with T given by A008315.
A027304
a(n) = Sum_{k=0..floor((n-5)/2)} T(n,k) * T(n,k+1), with T given by A008315.
Terms
- a(0) =5a(1) =14a(2) =126a(3) =384a(4) =2355a(5) =7568a(6) =39545a(7) =131768a(8) =632177a(9) =2162510a(10) =9853892a(11) =34384064a(12) =151498203a(13) =536917884a(14) =2311543325a(15) =8295107912a(16) =35123988977a(17) =127340511540a(18) =532611748052
External references
- oeis: A027304