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 A031269 #6 Sep 29 2013 15:39:15
%S A031269 1,2,3,1,0,1,3,2,3,4,1,1,1,4,2,1,0,3,2,4,1,0,3,4,1,4,1,3,3,0,0,2,4,4,
%T A031269 2,0,1,2,4,2,2,2,2,3,4,2,4,0,3,1,4,1,1,3,2,1,1,2,0,4,0,3,0,3,2,2,2,4,
%U A031269 1,1,0,3,1,3,2,1,1,4,0,4,1,1,2,2,4,4,0,4,3,3
%N A031269 Write the (n+1)st Fibonacci number in base 5 and juxtapose.
%t A031269 Flatten[Table[IntegerDigits[Fibonacci[n+1],5],{n,30}]] (* _Harvey P. Dale_, Sep 29 2013 *)
%K A031269 nonn
%O A031269 1,2
%A A031269 _Clark Kimberling_