Expansion of g.f.: 1/(Sum_{p odd prime} x^p)^2 (even powers only).

Terms

a(0) =1a(1) =-2a(2) =1a(3) =2a(4) =-6a(5) =6a(6) =3a(7) =-18a(8) =24a(9) =-2a(10) =-47a(11) =84a(12) =-44a(13) =-100a(14) =255a(15) =-218a(16) =-154a(17) =690a(18) =-823a(19) =-30a(20) =1684a(21) =-2684a(22) =1044a(23) =3586a(24) =-7868a(25) =5724a(26) =6114a(27) =-21042a(28) =22068a(29) =5286