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

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =5a(6) =10a(7) =18a(8) =38a(9) =91a(10) =211a(11) =472a(12) =1108a(13) =2754a(14) =6881a(15) =17101a(16) =43443a(17) =113565a(18) =300142a(19) =797191a(20) =2147414a(21) =5883976a(22) =16293712a(23) =45471429a(24) =128285353a(25) =366266188a(26) =1055534118a(27) =3066483484a(28) =8989837397a(29) =26602652605