a(n+1) = a(n) converted to base 9 from base 7 (written in base 10).

Terms

a(0) =7a(1) =9a(2) =11a(3) =13a(4) =15a(5) =19a(6) =23a(7) =29a(8) =37a(9) =47a(10) =59a(11) =93a(12) =137a(13) =211a(14) =343a(15) =729a(16) =1513a(17) =3133a(18) =8077a(19) =21435a(20) =70255a(21) =243939a(22) =1085583a(23) =5931677a(24) =43738095a(25) =406863821a(26) =4668281037a(27) =71095945599