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 A055348 #6 Mar 30 2012 17:37:11 %S A055348 1,-1,1,0,-3,4,25,-98,-543,4310,26980,-332265,-2797178,42158122, %T A055348 524926934,-7967880874,-158385569345,2011259946668,69891223752628, %U A055348 -565397452159321,-41784073805527265,58655029279732267 %N A055348 Column 1 of triangle A055347. %H A055348 <a href="/index/Mo#mobiles">Index entries for sequences related to mobiles</a> %K A055348 sign %O A055348 1,5 %A A055348 _Christian G. Bower_, May 14 2000