Duplicate of A001224.

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =4a(5) =5a(6) =9a(7) =12a(8) =21a(9) =30a(10) =51a(11) =76a(12) =127a(13) =195a(14) =322a(15) =504a(16) =826a(17) =1309a(18) =2135a(19) =3410a(20) =5545a(21) =8900a(22) =14445a(23) =23256a(24) =37701a(25) =60813a(26) =98514a(27) =159094a(28) =257608a(29) =416325