a(n) = Sum_{k=0..n} n^k * binomial(n,k) * binomial(2*k,k).
A340971
a(n) = Sum_{k=0..n} n^k * binomial(n,k) * binomial(2*k,k).
Terms
- a(0) =1a(1) =3a(2) =33a(3) =721a(4) =23649a(5) =1032801a(6) =56317969a(7) =3682424775a(8) =280767441537
External references
- oeis: A340971