Dirichlet inverse of the Jordan function J_2 (A007434).

Terms

a(0) =1a(1) =-3a(2) =-8a(3) =-3a(4) =-24a(5) =24a(6) =-48a(7) =-3a(8) =-8a(9) =72a(10) =-120a(11) =24a(12) =-168a(13) =144a(14) =192a(15) =-3a(16) =-288a(17) =24a(18) =-360a(19) =72a(20) =384a(21) =360a(22) =-528a(23) =24a(24) =-24a(25) =504a(26) =-8a(27) =144a(28) =-840a(29) =-576