a(n) = Sum_{k=0..n} n^(n-k) * binomial(2*k,k) * binomial(2*n,2*k).
A337388
a(n) = Sum_{k=0..n} n^(n-k) * binomial(2*k,k) * binomial(2*n,2*k).
Terms
- a(0) =1a(1) =3a(2) =34a(3) =587a(4) =12870a(5) =337877a(6) =10262004a(7) =352436961a(8) =13465074758a(9) =565280386625
External references
- oeis: A337388