Sum of digits (bits) in base two representation of 3^(2^n).

Terms

a(0) =2a(1) =2a(2) =3a(3) =6a(4) =11a(5) =26a(6) =56a(7) =97a(8) =204a(9) =415a(10) =769a(11) =1606a(12) =3268a(13) =6460a(14) =12889a(15) =25915a(16) =52046a(17) =104099a(18) =207000a(19) =416542a(20) =831430a(21) =1662247a(22) =3324374a(23) =6646337a(24) =13292865a(25) =26593542a(26) =53182276a(27) =106364450a(28) =212732814a(29) =425465107