Incorrect version of A082971.

Terms

a(0) =82a(1) =410a(2) =1918a(3) =8657a(4) =38225a(5) =166322a(6) =716170a(7) =3059864a(8) =12994936a(9) =54924212a(10) =231235054a(11) =970347575a(12) =4060697955a(13) =16952812170a(14) =70629116910a(15) =293720506860