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 A131337 #2 Mar 30 2012 17:25:22 %S A131337 1,2,4,9,16,32,57,106,188,337 %N A131337 Row sums of triangle A131336. %e A131337 a(4) = 9 = (3 + 3 + 2 + 2), sum of row 4, A131336. %Y A131337 Cf. A131332, A131333, A131334, A131335, A131336. %K A131337 nonn %O A131337 1,2 %A A131337 _Gary W. Adamson_, Jun 29 2007