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 A241774 #5 Apr 28 2014 11:17:53 %S A241774 1,2,9,29,108,399,1573,6249,25642,107751,466898,2071183,9429453, %T A241774 43889227,209111720,1017353435,5056450994,25627110560,132451351403, %U A241774 697165582228,3736595119730,20372395392794,112961465325799,636497947945382,3643481367551384 %N A241774 Number of standard Young tableaux with n cells and exactly three successions. %C A241774 A succession is a pair of cells (v, v+1) lying in the same row. %C A241774 Also number of ballot sequences having three flat steps. %Y A241774 Column k=3 of A238125. %K A241774 nonn %O A241774 4,2 %A A241774 _Joerg Arndt_ and _Alois P. Heinz_, Apr 28 2014