G.f.: Product_{k>0} (1-x^(5k-1))*(1-x^(5k-4))/((1-x^(5k-2))*(1-x^(5k-3))).

Terms

a(0) =1a(1) =-1a(2) =1a(3) =0a(4) =-1a(5) =1a(6) =-1a(7) =1a(8) =0a(9) =-1a(10) =2a(11) =-3a(12) =2a(13) =0a(14) =-2a(15) =4a(16) =-4a(17) =3a(18) =-1a(19) =-3a(20) =6a(21) =-7a(22) =5a(23) =0a(24) =-5a(25) =9a(26) =-10a(27) =7a(28) =-1a(29) =-7