a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026758.
A027232
a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026758.
Terms
- a(0) =1a(1) =4a(2) =19a(3) =72a(4) =355a(5) =1347a(6) =6843a(7) =26077a(8) =135752a(9) =519336a(10) =2760110a(11) =10591394a(12) =57299551a(13) =220393887a(14) =1210772453a(15) =4665698732a(16) =25974365600a(17) =100243916036a(18) =564517479641
External references
- oeis: A027232