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 A324448 #5 Feb 28 2019 12:55:40 %S A324448 1,10,141,2107,35568,661329,13444940,297333278,7122103435, %T A324448 183969320652,5102519835609,151340386825771,4782068352314304, %U A324448 160422533608810186,5695524314835911655,213389274860898491690,8414796730663230017112,348422910620718837979244 %N A324448 Number of labeled cyclic chord diagrams with n chords such that the minimal chord length equals four. %H A324448 Alois P. Heinz, <a href="/A324448/b324448.txt">Table of n, a(n) for n = 4..404</a> %F A324448 a(n) = A324430(n) - A324431(n). %Y A324448 Column k=4 of A324429. %Y A324448 Cf. A324430, A324431. %K A324448 nonn %O A324448 4,2 %A A324448 _Alois P. Heinz_, Feb 28 2019