Convolution sequence: this sequence convolved with A000041 gives powers of 2, (A000079).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =9a(6) =18a(7) =37a(8) =74a(9) =148a(10) =296a(11) =592a(12) =1183a(13) =2366a(14) =4732a(15) =9463a(16) =18926a(17) =37852a(18) =75704a(19) =151408a(20) =302816a(21) =605632a(22) =1211265a(23) =2422530a(24) =4845060a(25) =9690120a(26) =19380241a(27) =38760482a(28) =77520964a(29) =155041928