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 A241778 #3 Apr 28 2014 11:32:39 %S A241778 1,4,28,137,751,3797,19868,103169,544446,2892654,15609326,85185225, %T A241778 471914661,2647616529,15072126865,86928421109,508477806633, %U A241778 3013152898489,18098553323837,110098999926894,678500886312946,4233264326440478,26741870913391272 %N A241778 Number of standard Young tableaux with n cells and exactly seven successions. %C A241778 A succession is a pair of cells (v, v+1) lying in the same row. %C A241778 Also number of ballot sequences having seven flat steps. %Y A241778 Column k=7 of A238125. %K A241778 nonn %O A241778 8,2 %A A241778 _Joerg Arndt_ and _Alois P. Heinz_, Apr 28 2014