Number of runs in binary expansion of n (n>0); number of 1's in Gray code for n.

Terms

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