Positions of check bits in code in A075973.

Terms

a(0) =262143a(1) =133956095a(2) =2021408271a(3) =6872157809a(4) =11453421238a(5) =20188081042a(6) =31219700917a(7) =37548876508a(8) =74341529658a(9) =145177797287a(10) =249195030418a(11) =326072676800a(12) =638246908359a(13) =992606833010