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 A241803 #6 Apr 28 2014 19:04:07 %S A241803 1,279,19125,651245,14366695,233582056,3019039806,32552281146, %T A241803 302772441833,2489676658658,18436266612425,124754494349824, %U A241803 780244984225568,4553372454106529,24982642521157848,129722480362398371,640852528623371007,3026558205823169395 %N A241803 Number of ballot sequences of length n having exactly ten descents. %e A241803 a(15) = 1: [1,2,1,3,2,1,4,3,2,1,5,4,3,2,1]. %Y A241803 Column k=10 of A238121 and of A238122. %K A241803 nonn %O A241803 15,2 %A A241803 _Joerg Arndt_ and _Alois P. Heinz_, Apr 28 2014