a(n) = Sum_{k=0..2n-1} T(n,k) * T(n,k+1), with T given by A027082.
A027110
a(n) = Sum_{k=0..2n-1} T(n,k) * T(n,k+1), with T given by A027082.
Terms
- a(0) =2a(1) =11a(2) =80a(3) =591a(4) =4492a(5) =34859a(6) =274834a(7) =2194175a(8) =17697088a(9) =143951359a(10) =1179361946a(11) =9721994363a(12) =80573155210a(13) =670916858663
External references
- oeis: A027110