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Number of singly defective permutations of 1..n+6 with exactly 4 maxima.
2

%I #11 May 12 2020 19:57:07

%S 4760,199168,4643712,80506880,1163431808,14874150912,174293203968,

%T 1915121868800,20041282099200,201949448765440,1975285587312640,

%U 18866258297487360,176760773333450752,1630252849810636800,14841729785246515200,133664316735891701760,1192882240528106127360

%N Number of singly defective permutations of 1..n+6 with exactly 4 maxima.

%C A singly defective permutation omits one value and repeats another value.

%H Andrew Howroyd, <a href="/A183267/b183267.txt">Table of n, a(n) for n = 1..200</a>

%e Some solutions for n=2 with 4 maxima:

%e (7,5,3,6,1,5,2,8) (7,1,8,4,3,4,2,6) (6,3,7,2,8,3,5,4) (6,1,5,2,4,3,3,7).

%Y Column 4 of A183270.

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 03 2011

%E Terms a(10) and beyond from _Andrew Howroyd_, May 12 2020