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 A026104 #4 Mar 31 2012 13:20:43 %S A026104 1,3,6,10,15,24,33,44,55,69,92,115,138,161,186,217,248,287,328,369, %T A026104 410,451,492,533,590,649,708,767,826,885,944,1003,1068,1157,1246,1335, %U A026104 1424,1515,1616,1717,1818,1919,2020,2121,2222,2323,2424,2540,2667,2794,2921 %N A026104 a(n) = greatest number in row n of A026098 that is not a positive power of 2. %K A026104 nonn %O A026104 1,2 %A A026104 _Clark Kimberling_ %E A026104 Corrected and extended by _David Wasserman_, Aug 12 2002