G.f.: 1 = Sum_{n>=0} a(n) * x^n * Sum_{k=0..n} C(n,k)^3 * (-x)^k.
A247032
G.f.: 1 = Sum_{n>=0} a(n) * x^n * Sum_{k=0..n} C(n,k)^3 * (-x)^k.
Terms
- a(0) =1a(1) =1a(2) =8a(3) =215a(4) =13544a(5) =1646568a(6) =342128448a(7) =111806434449
External references
- oeis: A247032