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 A127109 #4 Oct 08 2012 18:34:24 %S A127109 1,1,2,11,44,440,10340,130130,2242240,43103010,1412110200,40204314200, %T A127109 1440111022400,100223104131200,2412020120304300,132411104114234000, %U A127109 10220244333202404000,333110040323043033000,23203132442322131244000,2010023231311114130111000 %N A127109 n! in base 5. %t A127109 FromDigits/@IntegerDigits[Range[0,20]!,5] (* _Harvey P. Dale_, Oct 08 2012 *) %Y A127109 Cf. A127032. %K A127109 nonn %O A127109 0,3 %A A127109 _Artur Jasinski_, Jan 05 2007 %E A127109 More terms from _Harvey P. Dale_, Oct 08 2012