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 A324446 #5 Feb 28 2019 12:47:16 %S A324446 1,3,24,225,2489,32326,483968,8211543,155740501,3265307342, %T A324446 74995101843,1872508994356,50500982610620,1463062187672336, %U A324446 45314261742435296,1494164679669072424,52257665502536426741,1932255827699763531474,75312621088768346098203 %N A324446 Number of labeled cyclic chord diagrams with n chords such that the minimal chord length equals two. %H A324446 Alois P. Heinz, <a href="/A324446/b324446.txt">Table of n, a(n) for n = 2..404</a> %F A324446 a(n) = A003436(n) - A306386(n). %Y A324446 Column k=2 of A324429. %Y A324446 Cf. A003436, A306386. %K A324446 nonn %O A324446 2,2 %A A324446 _Alois P. Heinz_, Feb 28 2019