Dirichlet g.f.: zeta(s-2)^2 * (1 - 2^(3-s)) / zeta(s).

Terms

a(0) =1a(1) =-1a(2) =17a(3) =-16a(4) =49a(5) =-17a(6) =97a(7) =-112a(8) =225a(9) =-49a(10) =241a(11) =-272a(12) =337a(13) =-97a(14) =833a(15) =-640a(16) =577a(17) =-225a(18) =721a(19) =-784a(20) =1649a(21) =-241a(22) =1057a(23) =-1904a(24) =1825a(25) =-337a(26) =2673a(27) =-1552a(28) =1681a(29) =-833