Positions of check bits in code in A075970.

Terms

a(0) =131071a(1) =33423871a(2) =505290271a(3) =1717986919a(4) =2863311531a(5) =3579139413a(6) =5055419121a(7) =10094819116a(8) =22645810751a(9) =41800423686a(10) =78201007705a(11) =120750351308a(12) =163539395911a(13) =320531740310