Index of 2^n in A359804.

Terms

a(0) =1a(1) =2a(2) =5a(3) =10a(4) =24a(5) =38a(6) =87a(7) =172a(8) =349a(9) =706a(10) =1407a(11) =2752a(12) =5487a(13) =11103a(14) =22285a(15) =44429a(16) =88993a(17) =177746a(18) =356460a(19) =712129a(20) =1425163a(21) =2849424a(22) =5701776a(23) =11401709a(24) =22804522a(25) =45608572a(26) =91219022a(27) =182438457a(28) =364879209a(29) =729757797