Dirichlet convolution of powers of 2 (2,4,8,...) with themselves.

Terms

a(0) =4a(1) =16a(2) =32a(3) =80a(4) =128a(5) =320a(6) =512a(7) =1152a(8) =2112a(9) =4352a(10) =8192a(11) =17152a(12) =32768a(13) =66560a(14) =131584a(15) =264448a(16) =524288a(17) =1053696a(18) =2097152a(19) =4203520a(20) =8390656a(21) =16793600a(22) =33554432a(23) =67147776a(24) =134218752a(25) =268500992a(26) =536879104a(27) =1073876992a(28) =2147483648