Bisection of A080107.

Terms

a(0) =1a(1) =3a(2) =12a(3) =59a(4) =339a(5) =2210a(6) =16033a(7) =127643a(8) =1103372a(9) =10269643a(10) =102225363a(11) =1082190554a(12) =12126858113a(13) =143268057587