This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A245400 #10 Jul 22 2014 22:18:02 %S A245400 9,9,9,9,9,9,9,9,9,18,18,18,18,27,27,27,36,36,45,45,54,63,72,81,90,99, %T A245400 108,126,144,162,180,198,225,252,288,324,360,405,459,513,576,648,729, %U A245400 819,927,1044,1170,1314,1485,1665,1872,2106,2376,2673,3006,3384,3807 %N A245400 Number of nonnegative integers with property that their base 9/8 expansion (see A024656) has n digits. %F A245400 a(n) = 9*A120194(n). %e A245400 a(2) = 9 since 80, 81, 82, 83, 84, 85, 86, 87, 88 are the base 9/8 representations of 9-17 respectively and these are the only integers with 2 digits. %o A245400 (Sage) %o A245400 A=[1] %o A245400 for i in [1..100]: %o A245400 A.append(ceil(((9-8)/8)*sum(A))) %o A245400 [9*x for x in A] %Y A245400 Cf. A245356, A120194, A024656, A081848. %K A245400 nonn,base %O A245400 1,1 %A A245400 _Tom Edgar_, Jul 21 2014