Duplicate of A164392.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =14a(5) =25a(6) =44a(7) =78a(8) =137a(9) =241a(10) =423a(11) =743a(12) =1304a(13) =2289a(14) =4017a(15) =7050a(16) =12372a(17) =21712a(18) =38102