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A152515 1/7 of the number of permutations of 6 indistinguishable copies of 1..n with exactly 4 local maxima. 1

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

%S 0,50,321315,824734660,1615456263653,2896390530019554,

%T 5041787615373941503,8691245890710074064416,

%U 14935422227548071392068185,25640373750597951750787951486,44004685572828990924291145512563,75515015253707870321041620455156412,129585276023496655588712207028376849165

%N 1/7 of the number of permutations of 6 indistinguishable copies of 1..n with exactly 4 local maxima.

%H Andrew Howroyd, <a href="/A152515/b152515.txt">Table of n, a(n) for n = 1..200</a>

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

%o a(n) = {PeaksBySig(vector(n,i,6), [3])[1]/7} \\ _Andrew Howroyd_, May 12 2020

%Y Cf. A152513, A334774.

%K nonn

%O 1,2

%A _R. H. Hardin_, Dec 06 2008

%E Terms a(7) and beyond from _Andrew Howroyd_, May 12 2020

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Last modified April 18 22:18 EDT 2024. Contains 371782 sequences. (Running on oeis4.)