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 A152501 #6 May 12 2020 12:55:11
%S A152501 0,0,46,22615,5036741,819235874,114962084772,14974498962192,
%T A152501 1876234090571968,230313563301166336,27966954502164518912,
%U A152501 3376705184454377873408,406486565581361073979392,48857132166440216820449280,5867654791849010140880306176,704409107074292841154786361344
%N A152501 1/8 the number of permutations of 3 indistinguishable copies of 1..n with exactly 4 local maxima.
%H A152501 Andrew Howroyd, <a href="/A152501/b152501.txt">Table of n, a(n) for n = 1..200</a>
%o A152501 (PARI) \\ PeaksBySig defined in A334774.
%o A152501 a(n) = {PeaksBySig(vector(n,i,3), [3])[1]/8} \\ _Andrew Howroyd_, May 12 2020
%Y A152501 Cf. A152499, A334774.
%K A152501 nonn
%O A152501 1,3
%A A152501 _R. H. Hardin_, Dec 06 2008
%E A152501 Terms a(9) and beyond from _Andrew Howroyd_, May 12 2020