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 A114115 #2 Mar 30 2012 18:59:12 %S A114115 1,-1,1,2,-2,1,-3,3,-2,1,2,-2,2,-2,1,0,0,-1,2,-2,1,2,-2,2,-2,2,-2,1, %T A114115 -5,5,-4,3,-2,2,-2,1,2,-2,2,-2,2,-2,2,-2,1,0,0,0,0,-1,2,-2,2,-2,1,2, %U A114115 -2,2,-2,2,-2,2,-2,2,-2,1,-2,2,-3,4,-4,3,-2,2,-2,2,-2,1,2,-2,2,-2,2,-2,2,-2,2,-2,2,-2,1 %N A114115 Inverse of number triangle A114114. %C A114115 Row sums are A088705. Product with partial sum matrix (1/(1-x),x) gives A114116. %e A114115 Triangle begins %e A114115 1; %e A114115 -1, 1; %e A114115 2,-2, 1; %e A114115 -3, 3,-2, 1; %e A114115 2,-2, 2,-2, 1; %e A114115 0, 0,-1, 2,-2, 1; %e A114115 2,-2, 2,-2, 2,-2, 1; %K A114115 sign,tabl %O A114115 0,4 %A A114115 _Paul Barry_, Nov 13 2005