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 A293917 #6 Oct 25 2017 18:07:32 %S A293917 1,19,252,3441,52938,919077,17783732,379205917,8832657552, %T A293917 223147872970,6078406509776,177602480890788,5541376133638552, %U A293917 183896037042429100,6468180930063929404,240368899912444102612,9410883311417206598912,387192534875365889313239 %N A293917 Number of linear chord diagrams having n chords and minimal chord length four. %H A293917 Alois P. Heinz, <a href="/A293917/b293917.txt">Table of n, a(n) for n = 4..404</a> %F A293917 a(n) ~ (exp(-3) - exp(-4)) * 2^(n + 1/2) * n^n / exp(n). - _Vaclav Kotesovec_, Oct 25 2017 %Y A293917 Column k=4 of A293881. %K A293917 nonn %O A293917 4,2 %A A293917 _Alois P. Heinz_, Oct 19 2017