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 A080234 #5 Apr 25 2016 12:18:57
%S A080234 1,1,-2,1,-1,-1,1,0,-2,0,1,1,-2,-2,1,1,2,-1,-4,-1,2,1,3,1,-5,-5,1,3,1,
%T A080234 4,4,-4,-10,-4,4,4,1,5,8,0,-14,-14,0,8,5,1,6,13,8,-14,-28,-14,8,13,6,
%U A080234 1,7,19,21,-6,-42,-42
%N A080234 Triangle whose rows are the differences of consecutive pairs of row elements of A080232.
%C A080234 Row sums are -1. Second row pairwise difference of A071919.
%e A080234 Rows are {1}, {1,-2}, {1,-1,-1}, {1,0,-2,0}, {1,1,-2,-2,1}, ...
%Y A080234 Cf. A080232, A071919.
%K A080234 sign,tabl
%O A080234 0,3
%A A080234 _Paul Barry_, Feb 09 2003