Numbers of form 3^i*4^j, with i, j >= 0.

Terms

a(0) =1a(1) =3a(2) =4a(3) =9a(4) =12a(5) =16a(6) =27a(7) =36a(8) =48a(9) =64a(10) =81a(11) =108a(12) =144a(13) =192a(14) =243a(15) =256a(16) =324a(17) =432a(18) =576a(19) =729a(20) =768a(21) =972a(22) =1024a(23) =1296a(24) =1728a(25) =2187a(26) =2304a(27) =2916a(28) =3072a(29) =3888