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 A241802 #6 Apr 28 2014 19:03:45 %S A241802 5,555,24060,595052,10131071,131722015,1394425753,12538397433, %T A241802 98654859370,694083988620,4440550793116,26165677158969, %U A241802 143525057166497,738895115800678,3596200018311737,16639581043371855,73574528888085621,312133508358624077,1275409396131467499 %N A241802 Number of ballot sequences of length n having exactly nine descents. %e A241802 a(14) = 5: [1,2,1,3,2,1,4,3,2,1,4,3,2,1], [1,2,1,3,2,1,4,3,2,1,5,3,2,1], [1,2,1,3,2,1,4,3,2,1,5,4,2,1], [1,2,1,3,2,1,4,3,2,1,5,4,3,1], [1,2,1,3,2,1,4,3,2,1,5,4,3,2]. %Y A241802 Column k=9 of A238121 and of A238122. %K A241802 nonn %O A241802 14,1 %A A241802 _Joerg Arndt_ and _Alois P. Heinz_, Apr 28 2014