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 A051814 #4 Jun 11 2014 17:24:22
%S A051814 1,7,40,240,1448,8630,53545,371845,3267453,36428242,442762543,
%T A051814 5217693527,57321559329,586532407659,5666269188709,52728701479194
%N A051814 Number of n-digit numbers with nonzero multiplicative digital root 3.
%D A051814 William Mayne, sci.math, Jun 15 1991
%F A051814 # { i : 10^(n-1) < i < 10^n and A051802(i)=3 }
%Y A051814 Cf. A051802, A051805, A051823.
%K A051814 nonn,base,hard
%O A051814 1,2
%A A051814 _Dan Hoey_, Dec 09 1999