Duplicate of A048139.

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =8a(5) =16a(6) =30a(7) =54a(8) =94a(9) =168a(10) =287a(11) =493a(12) =831a(13) =1391a(14) =2293a(15) =3769a(16) =6114a(17) =9867