Erroneous version of A000627.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =5a(6) =7a(7) =13a(8) =20a(9) =35a(10) =55a(11) =96a(12) =156a(13) =267a(14) =433a(15) =747a(16) =1239a(17) =2089a(18) =3498a(19) =5912