Duplicate of A007576.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =7a(5) =15a(6) =35a(7) =87a(8) =217a(9) =547a(10) =1417a(11) =3735a(12) =9911a(13) =26513a(14) =71581a(15) =194681a(16) =532481