423865

Appears in sequences

• a(n) = Sum_{k=0..n} (3*n)!/(3*k)!.at n=3A087350
• Expansion of e.g.f. exp(x) / (1 - x^3).at n=9A330044
• a(n) = n! * Sum_{k=0..floor(n/3)} 1 / (3*k)!.at n=9A352659