Numbers whose base-4 representation contains no 1's and exactly four 2's.

Terms

a(0) =170a(1) =554a(2) =650a(3) =674a(4) =680a(5) =683a(6) =686a(7) =698a(8) =746a(9) =938a(10) =2090a(11) =2186a(12) =2210a(13) =2216a(14) =2219a(15) =2222a(16) =2234a(17) =2282a(18) =2570a(19) =2594a(20) =2600a(21) =2603a(22) =2606a(23) =2618a(24) =2690a(25) =2696a(26) =2699a(27) =2702a(28) =2720a(29) =2723