a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026703.
A026997
a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026703.
Terms
- a(0) =1a(1) =6a(2) =35a(3) =168a(4) =926a(5) =4294a(6) =23224a(7) =106690a(8) =571926a(9) =2617886a(10) =13965688a(11) =63815684a(12) =339452265a(13) =1549699466a(14) =8228066295a(15) =37543939462a(16) =199095075169a(17) =908167940082
External references
- oeis: A026997