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 A241775 #3 Apr 28 2014 11:19:13 %S A241775 1,3,13,49,201,802,3343,14368,62909,282989,1299074,6111610,29330177, %T A241775 143869556,719339872,3669604633,19062972671,100880716332,543086732800, %U A241775 2974442015323,16556687511535,93655725178808,537951557765438,3137040309057826,18560431188723607 %N A241775 Number of standard Young tableaux with n cells and exactly four successions. %C A241775 A succession is a pair of cells (v, v+1) lying in the same row. %C A241775 Also number of ballot sequences having four flat steps. %Y A241775 Column k=4 of A238125. %K A241775 nonn %O A241775 5,2 %A A241775 _Joerg Arndt_ and _Alois P. Heinz_, Apr 28 2014