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 A113141 #2 Mar 30 2012 18:59:12 %S A113141 1,-3,1,2,-5,1,-2,10,-7,1,2,-14,22,-9,1,-2,18,-46,38,-11,1,2,-22,78, %T A113141 -106,58,-13,1,-2,26,-118,230,-202,82,-15,1,2,-30,166,-426,538,-342, %U A113141 110,-17,1,-2,34,-222,710,-1194,1082,-534,142,-19,1,2,-38,286,-1098,2330,-2814,1958,-786,178,-21,1 %N A113141 Inverse of a Delannoy related triangle. %C A113141 First column is (-1)^n*A104435(n). Row sums are 1,-2,-2,2,2,-2,-2,... Second column is A113142. Inverse of A113139. %e A113141 Triangle begins %e A113141 1; %e A113141 -3, 1; %e A113141 2, -5, 1; %e A113141 -2, 10, -7, 1; %e A113141 2, -14, 22, -9, 1; %e A113141 -2, 18, -46, 38, -11, 1; %K A113141 sign,tabl %O A113141 0,2 %A A113141 _Paul Barry_, Oct 15 2005