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 A152503 #7 May 12 2020 12:55:24
%S A152503 0,0,0,925,5134608,7080780596,5503883684118,3175651343215500,
%T A152503 1543855504958661492,676391857775294288488,277604477433374392213008,
%U A152503 109265969423431070616562496,41856404659462959845867172864,15752452465692536904424614273024,5860017184412283112523269770190848
%N A152503 1/8 of the number of permutations of 3 indistinguishable copies of 1..n with exactly 6 local maxima.
%H A152503 Andrew Howroyd, <a href="/A152503/b152503.txt">Table of n, a(n) for n = 1..200</a>
%o A152503 (PARI) \\ PeaksBySig defined in A334774.
%o A152503 a(n) = {PeaksBySig(vector(n,i,3), [5])[1]/8} \\ _Andrew Howroyd_, May 12 2020
%Y A152503 Cf. A152499, A334774.
%K A152503 nonn
%O A152503 1,4
%A A152503 _R. H. Hardin_, Dec 06 2008
%E A152503 Terms a(9) and beyond from _Andrew Howroyd_, May 12 2020