a(n)=n if n <= 3, otherwise a(n) = A007477(n-1) + A007477(n).

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =9a(5) =17a(6) =33a(7) =66a(8) =134a(9) =277a(10) =579a(11) =1224a(12) =2610a(13) =5609a(14) =12135a(15) =26408a(16) =57770a(17) =126962a(18) =280192a(19) =620674a(20) =1379586a(21) =3075943a(22) =6877611a(23) =15417934a(24) =34646156a(25) =78027146a(26) =176087292a(27) =398143230a(28) =901827322a(29) =2046112299