Shifts 2 places left under Dirichlet convolution.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =5a(6) =4a(7) =12a(8) =8a(9) =28a(10) =17a(11) =60a(12) =34a(13) =134a(14) =68a(15) =276a(16) =140a(17) =580a(18) =280a(19) =1186a(20) =560a(21) =2436a(22) =1128a(23) =4906a(24) =2256a(25) =9976a(26) =4516a(27) =20020a(28) =9048a(29) =40324