Moser-de Bruijn sequence: sums of distinct powers of 4.

Terms

a(0) =0a(1) =1a(2) =4a(3) =5a(4) =16a(5) =17a(6) =20a(7) =21a(8) =64a(9) =65a(10) =68a(11) =69a(12) =80a(13) =81a(14) =84a(15) =85a(16) =256a(17) =257a(18) =260a(19) =261a(20) =272a(21) =273a(22) =276a(23) =277a(24) =320a(25) =321a(26) =324a(27) =325a(28) =336a(29) =337