Exponent of 3 (value of j) in n-th number of form 2^i*3^j (see A003586).

Terms

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