a(0)=1, a(1)=2; thereafter a(n) = f(n-1) + f(n-2) where f() = A164387().

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =12a(5) =22a(6) =39a(7) =70a(8) =127a(9) =231a(10) =419a(11) =759a(12) =1375a(13) =2492a(14) =4517a(15) =8187a(16) =14838a(17) =26892a(18) =48739a(19) =88335a(20) =160099a(21) =290164a(22) =525894a(23) =953132a(24) =1727460a(25) =3130855a(26) =5674373a(27) =10284254a(28) =18639219a(29) =33781788