Base-7 Keith numbers.

Terms

a(0) =8a(1) =13a(2) =16a(3) =19a(4) =24a(5) =32a(6) =40a(7) =48a(8) =57a(9) =114a(10) =125a(11) =145a(12) =171a(13) =228a(14) =285a(15) =329a(16) =342a(17) =589a(18) =1969a(19) =2833a(20) =4938a(21) =30318a(22) =43153a(23) =168516a(24) =336774a(25) =375008a(26) =652933a(27) =1068018a(28) =2955098a(29) =5658387