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 A179815 #2 Mar 30 2012 18:53:10 %S A179815 1,3,21,163,1259,9657,73949,566797,4352755,33501979,258431853, %T A179815 1997743677,15473296249 %N A179815 Numbers such that n=2*k in triangle A175105. %C A179815 All numbers in this sequence are odd. %K A179815 nonn %O A179815 1,2 %A A179815 _Mats Granvik_, Jul 28 2010