a(n) = A119435(2^n).

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =6a(5) =8a(6) =11a(7) =15a(8) =20a(9) =27a(10) =36a(11) =48a(12) =64a(13) =85a(14) =116a(15) =153a(16) =208a(17) =273a(18) =366a(19) =493a(20) =649a(21) =888a(22) =1161a(23) =1579a(24) =2092a(25) =2784a(26) =3783a(27) =4946a(28) =6772a(29) =8875