Numbers with the property that all pairs of consecutive base-4 digits differ by more than 1.

Terms

a(0) =1a(1) =2a(2) =3a(3) =7a(4) =8a(5) =12a(6) =13a(7) =28a(8) =29a(9) =34a(10) =35a(11) =50a(12) =51a(13) =55a(14) =114a(15) =115a(16) =119a(17) =136a(18) =140a(19) =141a(20) =200a(21) =204a(22) =205a(23) =220a(24) =221a(25) =456a(26) =460a(27) =461a(28) =476a(29) =477