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 A241780 #3 Apr 28 2014 11:34:58 %S A241780 1,5,42,238,1499,8635,50873,294903,1724689,10094399,59679199, %T A241780 355198229,2136972743,12972026795,79626155414,493684963581, %U A241780 3095482758334,19612796554079,125656314294772,813576800235695,5325370849930701,35223931484275717,235474448496780769 %N A241780 Number of standard Young tableaux with n cells and exactly nine successions. %C A241780 A succession is a pair of cells (v, v+1) lying in the same row. %C A241780 Also number of ballot sequences having nine flat steps. %Y A241780 Column k=9 of A238125. %K A241780 nonn %O A241780 10,2 %A A241780 _Joerg Arndt_ and _Alois P. Heinz_, Apr 28 2014