Positions of check bits in code in A075946.

Terms

a(0) =511a(1) =7711a(2) =26215a(3) =43691a(4) =54613a(5) =77013a(6) =143153a(7) =184230a(8) =202940a(9) =276813a(10) =345179a(11) =480029a(12) =544139a(13) =761113a(14) =1072338a(15) =1359202a(16) =1694281a(17) =2144108a(18) =2517759a(19) =2795038a(20) =4010901a(21) =4242830a(22) =4993784a(23) =5477626a(24) =7987334a(25) =8483793a(26) =9235006