Expansion of Sum_{k>=0} ( x / (1 - (k * x)^3) )^k.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =17a(6) =82a(7) =258a(8) =818a(9) =5671a(10) =43363a(11) =240520a(12) =1183168a(13) =8547054a(14) =77831681a(15) =596258173a(16) =4031934111a(17) =33313129161a(18) =338733239446