a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026747.
A027224
a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026747.
Terms
- a(0) =1a(1) =6a(2) =24a(3) =132a(4) =500a(5) =2728a(6) =10324a(7) =56651a(8) =215323a(9) =1191987a(10) =4549786a(11) =25420734a(12) =97369588a(13) =548884043a(14) =2108335364a(15) =11983465575a(16) =46136052623a(17) =264215445322
External references
- oeis: A027224