A152506 - OEIS

%I #6 May 12 2020 12:55:38

%S 0,1,3277,2483739,1156102209,443469188267,156475306087585,

%T 53194863262703203,17785402102372820321,5902647043581987876939,

%U 1952635794694419540863057,645038537405519790637628675,212955626342843141187623423793,70288152907297654332280282998411

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

%H Andrew Howroyd, <a href="/A152506/b152506.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), [3])[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