login

Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

1/5 of the number of permutations of 4 indistinguishable copies of 1..n with exactly 5 local maxima.
1

%I #6 May 12 2020 12:55:45

%S 0,0,1268,5299607,8184246829,8518545179048,7375381060406666,

%T 5823800163847281553,4385124494281967244359,3220844410144729325085834,

%U 2335142573256061888321206228,1681577911560502131835994578291,1206702021031355908214429714812273

%N 1/5 of the number of permutations of 4 indistinguishable copies of 1..n with exactly 5 local maxima.

%H Andrew Howroyd, <a href="/A152507/b152507.txt">Table of n, a(n) for n = 1..200</a>

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

%o a(n) = {PeaksBySig(vector(n,i,4), [4])[1]/5} \\ _Andrew Howroyd_, May 12 2020

%Y Cf. A152504, A334774.

%K nonn

%O 1,3

%A _R. H. Hardin_, Dec 06 2008

%E Terms a(8) and beyond from _Andrew Howroyd_, May 12 2020