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

Terms

a(0) =1a(1) =1a(2) =5a(3) =17a(4) =44a(5) =127a(6) =332a(7) =866a(8) =2182a(9) =5412a(10) =13119a(11) =31292a(12) =73516a(13) =170136a(14) =388829a(15) =877653a(16) =1959111a(17) =4327221a(18) =9464856a(19) =20511598a(20) =44067446a(21) =93901142a(22) =198539477a(23) =416696608a(24) =868448305a(25) =1797890682a(26) =3698350956a(27) =7561361750a(28) =15369154555a(29) =31064311255