Indices of terms of A288349 that are powers of 2.

Terms

a(0) =1a(1) =2a(2) =3a(3) =18a(4) =95a(5) =440a(6) =1897a(7) =7882a(8) =32139a(9) =129804a(10) =521741a(11) =2092046a(12) =8378383a(13) =33533968a(14) =134176785a(15) =536789010a(16) =2147319827a(17) =8589606932a(18) =34359083029a(19) =137437642774a(20) =549753192471