Number of ones in the binary expansion of 3^n.

Terms

a(0) =1a(1) =2a(2) =2a(3) =4a(4) =3a(5) =6a(6) =6a(7) =5a(8) =6a(9) =8a(10) =9a(11) =13a(12) =10a(13) =11a(14) =14a(15) =15a(16) =11a(17) =14a(18) =14a(19) =17a(20) =17a(21) =20a(22) =19a(23) =22a(24) =16a(25) =18a(26) =24a(27) =30a(28) =25a(29) =25