a(n) = Sum_{k=0..n-1} binomial(4*k,k) * binomial(4*n-4*k,n-k-1).
A386611
a(n) = Sum_{k=0..n-1} binomial(4*k,k) * binomial(4*n-4*k,n-k-1).
Terms
- a(0) =0a(1) =1a(2) =12a(3) =126a(4) =1268a(5) =12513a(6) =122148a(7) =1184364a(8) =11432100a(9) =109997460a(10) =1055891248a(11) =10117633542a(12) =96812495820a(13) =925334377822
External references
- oeis: A386611