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 A241796 #6 Apr 28 2014 19:01:18 %S A241796 1,17,145,836,3846,15002,52132,164576,484609,1337597,3521517,8850458, %T A241796 21485321,50358968,114911640,255114977,554333346,1178070741, %U A241796 2459840199,5042845917,10185374250,20257833206,39778823250,77088115856,147739793527,279923493220 %N A241796 Number of ballot sequences of length n having exactly three descents. %e A241796 a(6) = 1: [1,2,1,3,2,1]. %Y A241796 Column k=3 of A238121 and of A238122. %K A241796 nonn %O A241796 6,2 %A A241796 _Joerg Arndt_ and _Alois P. Heinz_, Apr 28 2014