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A159724 Number of permutations of 3 indistinguishable copies of 1..n arranged in a circle with exactly 4 local maxima. 1

%I #6 May 14 2020 16:56:45

%S 0,0,144,174216,57255120,11991842928,2031699317760,307822441390848,

%T 43794222405754752,6002662060069524480,803884492717330692096,

%U 106029178904806181240832,13837293346888202240065536,1791753662455712320172064768,230600676245973342632159477760

%N Number of permutations of 3 indistinguishable copies of 1..n arranged in a circle with exactly 4 local maxima.

%H Andrew Howroyd, <a href="/A159724/b159724.txt">Table of n, a(n) for n = 1..200</a>

%o (PARI) \\ CircPeaksBySig defined in A334778.

%o a(n) = {CircPeaksBySig(vector(n, i, 3), [4])[1]} \\ _Andrew Howroyd_, May 14 2020

%Y Cf. A159721, A159722, A334778.

%K nonn

%O 1,3

%A _R. H. Hardin_, Apr 20 2009

%E Terms a(8) and beyond from _Andrew Howroyd_, May 14 2020

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Last modified April 23 13:11 EDT 2024. Contains 371913 sequences. (Running on oeis4.)