68933

Appears in sequences

• G.f.: A(x) = Sum_{n>=0} (3n)!/(n!)^3 * x^(3n)/(1-x-x^2)^(3n+1).at n=10A181545
• Main diagonal of A365991: the n-th term in the trajectory of n under the A185452 map.at n=38A368301