Duplicate of A089116.

Terms

a(0) =0a(1) =1a(2) =3a(3) =7a(4) =17a(5) =37a(6) =77a(7) =158a(8) =314a(9) =611a(10) =1174a(11) =2222a(12) =4156a(13) =7703a(14) =14149a(15) =25790a(16) =46703