Dirichlet convolution of b_n=2^(n-1) with itself.

Terms

a(0) =1a(1) =4a(2) =8a(3) =20a(4) =32a(5) =80a(6) =128a(7) =288a(8) =528a(9) =1088a(10) =2048a(11) =4288a(12) =8192a(13) =16640a(14) =32896a(15) =66112a(16) =131072a(17) =263424a(18) =524288a(19) =1050880a(20) =2097664a(21) =4198400a(22) =8388608a(23) =16786944a(24) =33554688a(25) =67125248a(26) =134219776a(27) =268469248a(28) =536870912a(29) =1073812480