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 A241800 #5 Apr 28 2014 19:02:53 %S A241800 32,1310,26159,349021,3537427,29216728,205795528,1274811402, %T A241800 7106683612,36230838069,171229815244,757346853197,3162754360421, %U A241800 12546713825786,47572219652564,173111049909503,607264725020735,2059610656640095,6776341942347065,21674530092011291 %N A241800 Number of ballot sequences of length n having exactly seven descents. %Y A241800 Column k=7 of A238121 and of A238122. %K A241800 nonn %O A241800 12,1 %A A241800 _Joerg Arndt_ and _Alois P. Heinz_, Apr 28 2014