Numbers with exactly 3 0's in their base 4 expansion.

Terms

a(0) =64a(1) =128a(2) =192a(3) =257a(4) =258a(5) =259a(6) =260a(7) =264a(8) =268a(9) =272a(10) =288a(11) =304a(12) =320a(13) =384a(14) =448a(15) =513a(16) =514a(17) =515a(18) =516a(19) =520a(20) =524a(21) =528a(22) =544a(23) =560a(24) =576a(25) =640a(26) =704a(27) =769a(28) =770a(29) =771