(s(n)+1)/9, where s(n)=n-th base 9 palindrome that starts with 8.

Terms

a(0) =1a(1) =9a(2) =73a(3) =74a(4) =75a(5) =76a(6) =77a(7) =78a(8) =79a(9) =80a(10) =81a(11) =649a(12) =659a(13) =669a(14) =679a(15) =689a(16) =699a(17) =709a(18) =719a(19) =729a(20) =5833a(21) =5842a(22) =5851a(23) =5860a(24) =5869a(25) =5878a(26) =5887a(27) =5896a(28) =5905a(29) =5915