G.f.: Product_{m>=1} 1/(1+x^m)^A000009(m).

Terms

a(0) =1a(1) =-1a(2) =0a(3) =-2a(4) =1a(5) =-2a(6) =2a(7) =-2a(8) =5a(9) =-3a(10) =8a(11) =-3a(12) =13a(13) =-6a(14) =16a(15) =-15a(16) =21a(17) =-28a(18) =21a(19) =-52a(20) =22a(21) =-90a(22) =23a(23) =-136a(24) =40a(25) =-190a(26) =79a(27) =-237a(28) =185a(29) =-254