a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026714.
A027202
a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026714.
Terms
- a(0) =1a(1) =6a(2) =35a(3) =196a(4) =1041a(5) =5778a(6) =29928a(7) =165372a(8) =847768a(9) =4670704a(10) =23822408a(11) =130996724a(12) =666301327a(13) =3659417070a(14) =18584154238a(15) =101986105620a(16) =517452054522
External references
- oeis: A027202