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

Terms

a(0) =1a(1) =2a(2) =8a(3) =20a(4) =56a(5) =128a(6) =316a(7) =684a(8) =1532a(9) =3192a(10) =6704a(11) =13436a(12) =26984a(13) =52352a(14) =101316a(15) =191320a(16) =359334a(17) =662292a(18) =1213360a(19) =2189380a(20) =3925432a(21) =6951592a(22) =12231332a(23) =21298452a(24) =36856840a(25) =63211164a(26) =107765896a(27) =182295468a(28) =306625208a(29) =512190992