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 A241795 #7 Apr 28 2014 19:00:54 %S A241795 3,21,101,373,1174,3337,8642,21148,48713,108147,229984,476430,955667, %T A241795 1879169,3603751,6801106,12584048,22974152,41268291,73301654, %U A241795 128441712,222871187,382322022,650209758,1094918922,1829777544,3031447986,4987910871,8144753275 %N A241795 Number of ballot sequences of length n having exactly two descents. %e A241795 a(5) = 3: [1,2,1,2,1], [1,2,1,3,1], [1,2,1,3,2]. %Y A241795 Column k=2 of A238121 and of A238122. %K A241795 nonn %O A241795 5,1 %A A241795 _Joerg Arndt_ and _Alois P. Heinz_, Apr 28 2014