Basis for code in A075955.

Terms

a(0) =8191a(1) =1040447a(2) =15786439a(3) =53683801a(4) =89475754a(5) =426151179a(6) =3759235934a(7) =13422994867a(8) =22549990279a(9) =40403963324a(10) =206697639567a(11) =825177352150