a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026670.
A026983
a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026670.
Terms
- a(0) =1a(1) =8a(2) =47a(3) =224a(4) =1130a(5) =4868a(6) =23404a(7) =97230a(8) =457264a(9) =1868456a(10) =8679894a(11) =35162196a(12) =162087345a(13) =653396608a(14) =2996092939a(15) =12041970574a(16) =55006554003a(17) =220673343660
External references
- oeis: A026983