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

Terms

a(0) =1a(1) =1a(2) =5a(3) =11a(4) =35a(5) =69a(6) =200a(7) =398a(8) =1014a(9) =2069a(10) =4820a(11) =9716a(12) =21787a(13) =43209a(14) =92530a(15) =182773a(16) =378676a(17) =737526a(18) =1492451a(19) =2872788a(20) =5686194a(21) =10837935a(22) =21052463a(23) =39699970a(24) =75972300a(25) =141818166a(26) =267607065a(27) =495142606a(28) =922920753a(29) =1692529453