Expansion of Product_{i>=1, j>=1} ((1 + x^(i*j))/(1 - x^(i*j)))^(i*j).

Terms

a(0) =1a(1) =2a(2) =10a(3) =30a(4) =98a(5) =270a(6) =786a(7) =2046a(8) =5418a(9) =13556a(10) =33726a(11) =81002a(12) =192902a(13) =447562a(14) =1027990a(15) =2316750a(16) =5165398a(17) =11345298a(18) =24668952a(19) =52972902a(20) =112688802a(21) =237193354a(22) =494933514a(23) =1023238806a(24) =2098662698a(25) =4269141516a(26) =8620916966a(27) =17280687472a(28) =34405835066a(29) =68044209950