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 A126386 #5 Mar 31 2012 12:35:05
%S A126386 1,32,94,278,824,2446,7268,21612,64302,191406,569972,1697824,5058866,
%T A126386 15077156,44944738,134005046,399611304,1191849678,3555217476,
%U A126386 10606364688,31645944402,94431456984,281811640854,841088436306
%N A126386 Number of base 32 n-digit numbers with adjacent digits differing by one or less.
%C A126386 [Empirical] a(base,n)=a(base-1,n)+3^(n-1) for base>=n; a(base,n)=a(base-1,n)+3^(n-1)-2 when base=n-1
%o A126386 (S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-2](($[i]`-$[i+1]`>1)+($[i+1]`-$[i]`>1))
%K A126386 nonn,base
%O A126386 0,2
%A A126386 _R. H. Hardin_, Dec 26 2006