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

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =6a(5) =9a(6) =11a(7) =14a(8) =17a(9) =25a(10) =27a(11) =36a(12) =38a(13) =46a(14) =57a(15) =59a(16) =68a(17) =70a(18) =100a(19) =102a(20) =110a(21) =145a(22) =153a(23) =155a(24) =185a(25) =187a(26) =228a(27) =230a(28) =238a(29) =273