Expansion of Product_{k>=1} (1 + x^k) * (1 + x^(2*k)) * (1 + x^(3*k)) * (1 + x^(4*k)).

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =6a(5) =9a(6) =15a(7) =21a(8) =30a(9) =45a(10) =62a(11) =85a(12) =120a(13) =161a(14) =216a(15) =293a(16) =385a(17) =505a(18) =667a(19) =862a(20) =1112a(21) =1438a(22) =1833a(23) =2330a(24) =2965a(25) =3733a(26) =4688a(27) =5887a(28) =7334a(29) =9114