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 A051812 #7 Jan 14 2021 19:58:30
%S A051812 1,5,24,243,3048,35224,374890,3766188,36537927,348892847,3315037530,
%T A051812 31399344551,295789894509,2769886220702,25882768895688,243033400452156
%N A051812 Number of n-digit numbers with nonzero multiplicative digital root 1.
%C A051812 Not counting zero as a one-digit number.
%D A051812 William Mayne, sci.math, Jun 15 1991
%F A051812 a(n) = # { i : 10^(n-1) < i < 10^n and A051802(i)=1 }.
%Y A051812 Cf. A051802, A051803, A051821.
%K A051812 nonn,base,hard
%O A051812 1,2
%A A051812 _Dan Hoey_, Dec 09 1999