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

Terms

a(0) =1a(1) =3a(2) =9a(3) =21a(4) =48a(5) =99a(6) =198a(7) =375a(8) =693a(9) =1236a(10) =2160a(11) =3681a(12) =6168a(13) =10140a(14) =16434a(15) =26235a(16) =41376a(17) =64449a(18) =99342a(19) =151530a(20) =229032a(21) =343068a(22) =509760a(23) =751509a(24) =1099998a(25) =1598925a(26) =2309274a(27) =3314541a(28) =4729920a(29) =6711993