Numbers whose base-4 representation contains exactly four 1's and three 2's.

Terms

a(0) =5482a(1) =5530a(2) =5542a(3) =5545a(4) =5722a(5) =5734a(6) =5737a(7) =5782a(8) =5785a(9) =5797a(10) =6490a(11) =6502a(12) =6505a(13) =6550a(14) =6553a(15) =6565a(16) =6742a(17) =6745a(18) =6757a(19) =6805a(20) =9562a(21) =9574a(22) =9577a(23) =9622a(24) =9625a(25) =9637a(26) =9814a(27) =9817a(28) =9829a(29) =9877