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 A051829 #5 Jun 11 2014 17:24:23
%S A051829 1,5,30,210,1850,19528,233289,2805652,31522803,326897695,3190607915,
%T A051829 30250443755,287335303424,2785929699350,27611310448037,276727430606458
%N A051829 Number of numbers below 10^n with nonzero multiplicative digital root 9.
%D A051829 William Mayne, sci.math, Jun 15 1991
%F A051829 # { i : 10^(n-1) < i < 10^n and A051802(i)=9 }
%Y A051829 Cf. A051802, A051811, A051820.
%K A051829 nonn,base,hard
%O A051829 1,2
%A A051829 _Dan Hoey_, Dec 09 1999