Expansion of Product_{k>=1} (1 + x^k)^(3*k*(k-1)/2+1).

Terms

a(0) =1a(1) =1a(2) =4a(3) =14a(4) =35a(5) =96a(6) =242a(7) =609a(8) =1483a(9) =3565a(10) =8376a(11) =19389a(12) =44254a(13) =99584a(14) =221470a(15) =486810a(16) =1058914a(17) =2280519a(18) =4866492a(19) =10294313a(20) =21598679a(21) =44966391a(22) =92930485a(23) =190721585a(24) =388828094a(25) =787710401a(26) =1586166758a(27) =3175548134a(28) =6322372729a(29) =12520759979