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 A152507 #6 May 12 2020 12:55:45
%S A152507 0,0,1268,5299607,8184246829,8518545179048,7375381060406666,
%T A152507 5823800163847281553,4385124494281967244359,3220844410144729325085834,
%U A152507 2335142573256061888321206228,1681577911560502131835994578291,1206702021031355908214429714812273
%N A152507 1/5 of the number of permutations of 4 indistinguishable copies of 1..n with exactly 5 local maxima.
%H A152507 Andrew Howroyd, <a href="/A152507/b152507.txt">Table of n, a(n) for n = 1..200</a>
%o A152507 (PARI) \\ PeaksBySig defined in A334774.
%o A152507 a(n) = {PeaksBySig(vector(n,i,4), [4])[1]/5} \\ _Andrew Howroyd_, May 12 2020
%Y A152507 Cf. A152504, A334774.
%K A152507 nonn
%O A152507 1,3
%A A152507 _R. H. Hardin_, Dec 06 2008
%E A152507 Terms a(8) and beyond from _Andrew Howroyd_, May 12 2020