Numbers whose base-3 expansion has no run of digits with length < 2.

Terms

a(0) =4a(1) =8a(2) =13a(3) =26a(4) =36a(5) =40a(6) =44a(7) =72a(8) =76a(9) =80a(10) =108a(11) =117a(12) =121a(13) =125a(14) =134a(15) =216a(16) =229a(17) =234a(18) =238a(19) =242a(20) =324a(21) =328a(22) =332a(23) =351a(24) =360a(25) =364a(26) =368a(27) =377a(28) =396a(29) =400