Exponent of 2 (value of i) in n-th number of form 2^i*9^j.

Terms

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