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 A155042 #2 Mar 30 2012 18:53:09 %S A155042 0,1,2,5,9,21,39,82,162,330,652,1321,2625 %N A155042 Row sums of A155039. %C A155042 This sequence is the row sum of differences between two tables. Might be relevant to the matrix inverse of a triangular table. %K A155042 more,nonn %O A155042 1,3 %A A155042 _Mats Granvik_, Jan 19 2009