Expansion of Product_{i>=1, j>=0} (1 + x^(i * 3^j)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =3a(5) =4a(6) =7a(7) =8a(8) =10a(9) =17a(10) =20a(11) =24a(12) =36a(13) =42a(14) =52a(15) =72a(16) =85a(17) =103a(18) =139a(19) =164a(20) =197a(21) =256a(22) =301a(23) =361a(24) =456a(25) =536a(26) =637a(27) =794a(28) =930a(29) =1098