a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026386.
A026952
a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026386.
Terms
- a(0) =1a(1) =4a(2) =24a(3) =90a(4) =541a(5) =2032a(6) =12275a(7) =46472a(8) =282003a(9) =1075404a(10) =6549906a(11) =25125114a(12) =153481299a(13) =591529776a(14) =3622111560a(15) =14013307170a(16) =85975792075a(17) =333669151420
External references
- oeis: A026952