Numbers with exactly 2 1's in their base 4 expansion.

Terms

a(0) =5a(1) =17a(2) =20a(3) =22a(4) =23a(5) =25a(6) =29a(7) =37a(8) =53a(9) =65a(10) =68a(11) =70a(12) =71a(13) =73a(14) =77a(15) =80a(16) =82a(17) =83a(18) =88a(19) =90a(20) =91a(21) =92a(22) =94a(23) =95a(24) =97a(25) =100a(26) =102a(27) =103a(28) =105a(29) =109