a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A008288.
A026936
a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A008288.
Terms
- a(0) =1a(1) =14a(2) =131a(3) =1028a(4) =7333a(5) =49362a(6) =319943a(7) =2020552a(8) =12526153a(9) =76603094a(10) =463676491a(11) =2784550604a(12) =16619355501a(13) =98706690714a(14) =583943891087
External references
- oeis: A026936