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 A273166 #4 Aug 11 2016 05:51:13
%S A273166 1,2,0,-2,2,4,-4,-6,6,10,-8,-16,14,24,-24,-36,36,56,-52,-82,78,116,
%T A273166 -116,-168,166,242,-232,-338,328,468,-464,-648,640,892,-872,-1214,
%U A273166 1192,1636,-1620,-2198,2176
%N A273166 Row sums of triangle A274659.
%F A273166 a(n) = Sum_{m=0..n} A274659(n, m), n >= 0.
%Y A273166 Cf. A274659.
%K A273166 sign,easy
%O A273166 0,2
%A A273166 _Wolfdieter Lang_, Aug 04 2016