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

Terms

a(0) =1a(1) =1a(2) =4a(3) =8a(4) =22a(5) =40a(6) =101a(7) =183a(8) =412a(9) =765a(10) =1586a(11) =2899a(12) =5834a(13) =10484a(14) =20199a(15) =36246a(16) =67758a(17) =119837a(18) =219661a(19) =384200a(20) =690164a(21) =1197423a(22) =2114105a(23) =3632088a(24) =6332797a(25) =10779478a(26) =18555115a(27) =31354932a(28) =53385037a(29) =89494901