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 A152517 #7 May 10 2020 23:03:56
%S A152517 0,3,412,50080,6016512,722051072,86646800384,10397622337536,
%T A152517 1247714738176000,149725769101213696,17967092296776155136,
%U A152517 2156051075653940805632,258726129078829378961408,31047135489462617851822080,3725656258735540805375623168,447078751048265125343493357568
%N A152517 1/56 of the number of permutations of 7 indistinguishable copies of 1..n with exactly 2 local maxima.
%H A152517 Andrew Howroyd, <a href="/A152517/b152517.txt">Table of n, a(n) for n = 1..200</a>
%F A152517 a(n) = (13*120^(n-1) - 13*8^(n-1) - 14*(n-1)*8^(n-1))/448. - _Andrew Howroyd_, May 10 2020
%o A152517 (PARI) a(n) = {(13*120^(n-1) - 13*8^(n-1) - 14*(n-1)*8^(n-1))/448} \\ _Andrew Howroyd_, May 10 2020
%Y A152517 Cf. A152494, A334773.
%K A152517 nonn
%O A152517 1,2
%A A152517 _R. H. Hardin_, Dec 06 2008
%E A152517 Terms a(7) and beyond from _Andrew Howroyd_, May 10 2020