Numbers of form 6^i*7^j, with i, j >= 0.

Terms

a(0) =1a(1) =6a(2) =7a(3) =36a(4) =42a(5) =49a(6) =216a(7) =252a(8) =294a(9) =343a(10) =1296a(11) =1512a(12) =1764a(13) =2058a(14) =2401a(15) =7776a(16) =9072a(17) =10584a(18) =12348a(19) =14406a(20) =16807a(21) =46656a(22) =54432a(23) =63504a(24) =74088a(25) =86436a(26) =100842a(27) =117649a(28) =279936a(29) =326592