Expansion of (Sum_{k>=0} binomial(3*k,k) * x^k)^3.

A378483

Expansion of (Sum_{k>=0} binomial(3*k,k) * x^k)^3.

Terms

    a(0) =1a(1) =9a(2) =72a(3) =549a(4) =4077a(5) =29772a(6) =214884a(7) =1537677a(8) =10930923a(9) =77298849a(10) =544300992a(11) =3819184236a(12) =26718251868a(13) =186440019192

External references