G.f.: 1/((1-t^9)^2*(1-t)*(1-t^3)*(1-t^5)*(1-t^7)*(1-t^11)*(1-t^13)*(1-t^15)*(1-t^17)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =3a(6) =4a(7) =5a(8) =6a(9) =9a(10) =11a(11) =13a(12) =17a(13) =20a(14) =25a(15) =31a(16) =37a(17) =44a(18) =55a(19) =64a(20) =76a(21) =91a(22) =106a(23) =125a(24) =147a(25) =171a(26) =198a(27) =233a(28) =267a(29) =308