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 A159730 #6 May 14 2020 17:01:43
%S A159730 0,2,15042,18059184,11195742340,5293792219344,2205450812336100,
%T A159730 861515212667884608,324837276666570610668,119915580982794765091280,
%U A159730 43656420088142545411963444,15735834864508561392982184160,5628506716816811122561964710428,2000722502787397537117555256499248
%N A159730 Number of permutations of 4 indistinguishable copies of 1..n arranged in a circle with exactly 4 local maxima.
%H A159730 Andrew Howroyd, <a href="/A159730/b159730.txt">Table of n, a(n) for n = 1..200</a>
%o A159730 (PARI) \\ CircPeaksBySig defined in A334778.
%o A159730 a(n) = {CircPeaksBySig(vector(n, i, 4), [4])[1]} \\ _Andrew Howroyd_, May 14 2020
%Y A159730 Cf. A159727, A159728, A334778.
%K A159730 nonn
%O A159730 1,2
%A A159730 _R. H. Hardin_, Apr 20 2009
%E A159730 Terms a(7) and beyond from _Andrew Howroyd_, May 14 2020