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

Terms

a(0) =0a(1) =1a(2) =3a(3) =7a(4) =16a(5) =33a(6) =66a(7) =125a(8) =231a(9) =412a(10) =720a(11) =1227a(12) =2056a(13) =3380a(14) =5478a(15) =8745a(16) =13792a(17) =21483a(18) =33114a(19) =50510a(20) =76344a(21) =114356a(22) =169920a(23) =250503a(24) =366666a(25) =532975a(26) =769758a(27) =1104847a(28) =1576640a(29) =2237331