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