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 A159724 #6 May 14 2020 16:56:45
%S A159724 0,0,144,174216,57255120,11991842928,2031699317760,307822441390848,
%T A159724 43794222405754752,6002662060069524480,803884492717330692096,
%U A159724 106029178904806181240832,13837293346888202240065536,1791753662455712320172064768,230600676245973342632159477760
%N A159724 Number of permutations of 3 indistinguishable copies of 1..n arranged in a circle with exactly 4 local maxima.
%H A159724 Andrew Howroyd, <a href="/A159724/b159724.txt">Table of n, a(n) for n = 1..200</a>
%o A159724 (PARI) \\ CircPeaksBySig defined in A334778.
%o A159724 a(n) = {CircPeaksBySig(vector(n, i, 3), [4])[1]} \\ _Andrew Howroyd_, May 14 2020
%Y A159724 Cf. A159721, A159722, A334778.
%K A159724 nonn
%O A159724 1,3
%A A159724 _R. H. Hardin_, Apr 20 2009
%E A159724 Terms a(8) and beyond from _Andrew Howroyd_, May 14 2020