Expansion of (-1 + Product_{k>=1} 1 / (1 - x^k))^9.

Terms

a(0) =1a(1) =18a(2) =171a(3) =1149a(4) =6147a(5) =27891a(6) =111567a(7) =403722a(8) =1345896a(9) =4189334a(10) =12300174a(11) =34337403a(12) =91721385a(13) =235645425a(14) =584759880a(15) =1406588073a(16) =3289489002a(17) =7498465029a(18) =16697615817a(19) =36391839264a(20) =77758115283a(21) =163123713621a(22) =336420277812a(23) =682877289213