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 A137711 #2 Mar 30 2012 17:25:27 %S A137711 1,3,6,12,24,47,92,183,364,728,1465,2922,5834,11661 %N A137711 Row sums of triangle A137710. %e A137711 a(5) = 24 = sum of row 5 terms of triangle A137710: (16 + 4 + 2 + 1 + 1). %Y A137711 Cf. A137710. %K A137711 nonn %O A137711 1,2 %A A137711 _Gary W. Adamson_, Feb 08 2008