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 A112334 #3 Mar 30 2012 18:59:12 %S A112334 1,-2,1,0,-5,1,0,0,-8,1,0,0,0,-11,1,0,0,0,0,-14,1,0,0,0,0,0,-17,1,0,0, %T A112334 0,0,0,0,-20,1,0,0,0,0,0,0,0,-23,1,0,0,0,0,0,0,0,0,-26,1,0,0,0,0,0,0, %U A112334 0,0,0,-29,1,0,0,0,0,0,0,0,0,0,0,-32,1,0,0,0,0,0,0,0,0,0,0,0,-35,1,0,0,0,0,0,0,0,0,0,0,0,0,-38,1,0,0,0,0,0,0,0,0,0,0,0 %N A112334 Inverse of number triangle A112333. %C A112334 Row sums are A112335. %e A112334 Triangle begins %e A112334 1; %e A112334 -2,1; %e A112334 0,-5,1; %e A112334 0,0,-8,1; %e A112334 0,0,0,-11,1; %e A112334 0,0,0,0,-14,1; %e A112334 0,0,0,0,0,-17,1; %K A112334 sign,tabl %O A112334 0,2 %A A112334 _Paul Barry_, Sep 04 2005