Bitwise XOR of adjacent terms of A101120; also the nonzero terms of A101122.

Terms

a(0) =7a(1) =17a(2) =34a(3) =68a(4) =159a(5) =257a(6) =514a(7) =1028a(8) =2063a(9) =4097a(10) =8194a(11) =16388a(12) =32831a(13) =65537a(14) =131074a(15) =262148a(16) =524303a(17) =1048577a(18) =2097154a(19) =4194308a(20) =8388639a(21) =16777217a(22) =33554434a(23) =67108868a(24) =134217743a(25) =268435457a(26) =536870914a(27) =1073741828a(28) =2147483775