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 A126500 #5 Mar 31 2012 12:35:06
%S A126500 1,32,212,1428,9676,65800,448524,3062596,20939104,143307908,981612296,
%T A126500 6728277248,46143758054,316613006372,2173302900418,14923204166476,
%U A126500 102502175850752,704231575697316,4839430076086740,33262613275263868
%N A126500 Number of base 32 n-digit numbers with adjacent digits differing by three or less.
%C A126500 [Empirical] a(base,n)=a(base-1,n)+7^(n-1) for base>=3n-2; a(base,n)=a(base-1,n)+7^(n-1)-2 when base=3n-3
%o A126500 (S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-2](($[i]`-$[i+1]`>3)+($[i+1]`-$[i]`>3))
%Y A126500 Cf. Base 32 differing by two or less A126419, one or less A126386.
%K A126500 nonn,base
%O A126500 0,2
%A A126500 _R. H. Hardin_, Dec 27 2006