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A152502 1/12 of the number of permutations of 3 indistinguishable copies of 1..n with exactly 5 local maxima. 1

%I #6 May 12 2020 12:55:18

%S 0,0,1,7274,6251162,2764274116,897380159188,247392790837624,

%T 62200280199674352,14820288466400312448,3420153590479988396800,

%U 774303834249035054901248,173288568985609322651099136,38513999874946087671220207616,8524401267844398602674455314432

%N 1/12 of the number of permutations of 3 indistinguishable copies of 1..n with exactly 5 local maxima.

%H Andrew Howroyd, <a href="/A152502/b152502.txt">Table of n, a(n) for n = 1..200</a>

%o (PARI) \\ PeaksBySig defined in A334774.

%o a(n) = {PeaksBySig(vector(n,i,3), [4])[1]/12} \\ _Andrew Howroyd_, May 12 2020

%Y Cf. A152499, A334774.

%K nonn

%O 1,4

%A _R. H. Hardin_, Dec 06 2008

%E Terms a(9) and beyond from _Andrew Howroyd_, May 12 2020

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Last modified April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)