Index of 4^n within the sequence of the numbers of the form 4^i*6^j.

Terms

a(0) =1a(1) =2a(2) =4a(3) =7a(4) =11a(5) =15a(6) =20a(7) =26a(8) =33a(9) =40a(10) =48a(11) =57a(12) =67a(13) =78a(14) =89a(15) =101a(16) =114a(17) =128a(18) =142a(19) =157a(20) =173a(21) =190a(22) =208a(23) =226a(24) =245a(25) =265a(26) =286a(27) =307a(28) =329a(29) =352