n is equal to the number of 1's in all numbers <= n written in base 9.

Terms

a(0) =1a(1) =102772a(2) =102773a(3) =102774a(4) =102775a(5) =102776a(6) =102777a(7) =102778a(8) =102779a(9) =102780a(10) =142155a(11) =142156a(12) =737002a(13) =737003a(14) =737004a(15) =737005a(16) =737006a(17) =737007a(18) =737008a(19) =737009a(20) =737010a(21) =1594323a(22) =1594324a(23) =1697095a(24) =1697096a(25) =1697097a(26) =1697098