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 A055347 #6 Mar 30 2012 17:37:11 %S A055347 1,-1,1,1,-2,1,0,2,-3,1,-3,2,4,-4,1,4,-13,9,4,-5,1,25,-2,-53,30,5,-6, %T A055347 1,-98,222,-85,-104,69,2,-7,1,-543,-192,1462,-644,-212,136,0,-8,1, %U A055347 4310,-8809,2469,4541,-2573,-164,242,-8,-9,1,26980,17664,-83744,32573 %N A055347 Matrix inverse of triangle A055340(n+1,k). %H A055347 <a href="/index/Mo#mobiles">Index entries for sequences related to mobiles</a> %e A055347 1; -1,1; 1,-2,1; 0,2,-3,1; -3,2,4,-4,1; ... %K A055347 sign,tabl %O A055347 1,5 %A A055347 _Christian G. Bower_, May 14 2000