Bisection of A006950 (the even part).

Terms

a(0) =1a(1) =1a(2) =3a(3) =5a(4) =10a(5) =16a(6) =28a(7) =43a(8) =70a(9) =105a(10) =161a(11) =236a(12) =350a(13) =501a(14) =722a(15) =1016a(16) =1431a(17) =1981a(18) =2741a(19) =3740a(20) =5096a(21) =6868a(22) =9233a(23) =12306a(24) =16357a(25) =21581a(26) =28394a(27) =37128a(28) =48406a(29) =62777