Erroneous version of A006794.

Terms

a(0) =3a(1) =5a(2) =11a(3) =41a(4) =89a(5) =317a(6) =337a(7) =991a(8) =1873a(9) =2053a(10) =2377a(11) =4093a(12) =4297a(13) =4583a(14) =6569a(15) =13033a(16) =15877