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 A241801 #6 Apr 28 2014 19:03:15 %S A241801 14,932,26865,486170,6385041,66251021,572940736,4284412169, %T A241801 28422470746,170581304048,939549814317,4806572652156,23042550110214, %U A241801 104344981470162,448963898693786,1845829609158989,7281093726825326,27670464821261399,101613723592257039 %N A241801 Number of ballot sequences of length n having exactly eight descents. %e A241801 a(13) = 14: [1,2,1,3,2,1,3,2,1,4,3,2,1], [1,2,1,3,2,1,4,2,1,5,3,2,1], [1,2,1,3,2,1,4,3,1,5,4,2,1], [1,2,1,3,2,1,4,3,2,1,3,2,1], [1,2,1,3,2,1,4,3,2,1,4,2,1], [1,2,1,3,2,1,4,3,2,1,4,3,1], [1,2,1,3,2,1,4,3,2,1,4,3,2], [1,2,1,3,2,1,4,3,2,1,5,2,1], [1,2,1,3,2,1,4,3,2,1,5,3,1], [1,2,1,3,2,1,4,3,2,1,5,3,2], [1,2,1,3,2,1,4,3,2,1,5,4,1], [1,2,1,3,2,1,4,3,2,1,5,4,2], [1,2,1,3,2,1,4,3,2,1,5,4,3], [1,2,1,3,2,1,4,3,2,5,4,3,1]. %Y A241801 Column k=8 of A238121 and of A238122. %K A241801 nonn %O A241801 13,1 %A A241801 _Joerg Arndt_ and _Alois P. Heinz_, Apr 28 2014