a(n) = A287883(2^n).

Terms

a(0) =1a(1) =3a(2) =28a(3) =285a(4) =2874a(5) =29207a(6) =293858a(7) =2947737a(8) =29514646a(9) =295386007a(10) =2955097334a(11) =29553146265a(12) =295558787590