n written in fractional base 7/2.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =20a(8) =21a(9) =22a(10) =23a(11) =24a(12) =25a(13) =26a(14) =40a(15) =41a(16) =42a(17) =43a(18) =44a(19) =45a(20) =46a(21) =60a(22) =61a(23) =62a(24) =63a(25) =64a(26) =65a(27) =66a(28) =210a(29) =211