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Number of singly defective permutations of 1..n+4 with exactly 3 maxima.
2

%I #7 May 12 2020 19:57:00

%S 120,3552,57064,681984,6849792,61486080,511006848,4019699712,

%T 30364991488,222472642560,1592011745280,11183547482112,77409364082688,

%U 529414815744000,3585105638490112,24077527815290880,160571745918517248,1064387288330403840,7018456956044574720

%N Number of singly defective permutations of 1..n+4 with exactly 3 maxima.

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

%H Andrew Howroyd, <a href="/A183266/b183266.txt">Table of n, a(n) for n = 1..200</a>

%e Some solutions for n=3 with 3 maxima:

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

%Y Column 3 of A183270.

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 03 2011

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