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 A152515 #6 May 12 2020 18:18:55
%S A152515 0,50,321315,824734660,1615456263653,2896390530019554,
%T A152515 5041787615373941503,8691245890710074064416,
%U A152515 14935422227548071392068185,25640373750597951750787951486,44004685572828990924291145512563,75515015253707870321041620455156412,129585276023496655588712207028376849165
%N A152515 1/7 of the number of permutations of 6 indistinguishable copies of 1..n with exactly 4 local maxima.
%H A152515 Andrew Howroyd, <a href="/A152515/b152515.txt">Table of n, a(n) for n = 1..200</a>
%o A152515 (PARI) \\ PeaksBySig defined in A334774.
%o A152515 a(n) = {PeaksBySig(vector(n,i,6), [3])[1]/7} \\ _Andrew Howroyd_, May 12 2020
%Y A152515 Cf. A152513, A334774.
%K A152515 nonn
%O A152515 1,2
%A A152515 _R. H. Hardin_, Dec 06 2008
%E A152515 Terms a(7) and beyond from _Andrew Howroyd_, May 12 2020