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 A055370 #3 Mar 30 2012 17:37:11 %S A055370 1,-1,1,1,-2,1,-1,4,-4,1,0,-6,10,-5,1,5,1,-16,16,-7,1,-18,38,-12,-26, %T A055370 25,-8,1,27,-161,197,-45,-44,35,-10,1,67,211,-580,418,-82,-71,47,-11, %U A055370 1,-496,1285,-629,-782,839,-174,-91,60,-13,1,496,-7131,10638,-3619 %N A055370 Matrix inverse of triangle A055363(n+2,k). %e A055370 1; -1,1; 1,-2,1; -1,4,-4,1; 0,-6,10,-5,1; ... %K A055370 sign,tabl %O A055370 1,5 %A A055370 _Christian G. Bower_, May 16 2000