Erroneous version of A005115.

Terms

a(0) =1a(1) =2a(2) =3a(3) =7a(4) =23a(5) =29a(6) =157a(7) =1307a(8) =1669a(9) =1879a(10) =2089a(11) =249037a(12) =262897a(13) =725663