Expansion of (Product_{k>0} (1 - x^(3*k)) / (1 - x^k))^3 in powers of x.

Terms

a(0) =1a(1) =3a(2) =9a(3) =19a(4) =42a(5) =81a(6) =155a(7) =276a(8) =486a(9) =821a(10) =1368a(11) =2214a(12) =3541a(13) =5544a(14) =8586a(15) =13082a(16) =19740a(17) =29403a(18) =43414a(19) =63423a(20) =91935a(21) =132075a(22) =188418a(23) =266733a(24) =375232a(25) =524331a(26) =728514a(27) =1006216a(28) =1382604a(29) =1889739