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

Terms

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