Double, add 0, double, add 1, double, add 2, double, add 3, etc.

Terms

a(0) =1a(1) =2a(2) =2a(3) =4a(4) =5a(5) =10a(6) =12a(7) =24a(8) =27a(9) =54a(10) =58a(11) =116a(12) =121a(13) =242a(14) =248a(15) =496a(16) =503a(17) =1006a(18) =1014a(19) =2028a(20) =2037a(21) =4074a(22) =4084a(23) =8168a(24) =8179a(25) =16358a(26) =16370a(27) =32740a(28) =32753a(29) =65506