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A183265
Number of singly defective permutations of 1..n+2 with exactly 2 maxima.
2
3, 80, 860, 6576, 42112, 242688, 1306944, 6721280, 33448448, 162435072, 774052864, 3633229824, 16842670080, 77264322560, 351273107456, 1584582819840, 7098965819392, 31609517506560, 139978221551616, 616818283642880, 2705880365662208, 11821908555202560, 51457052429516800
OFFSET
1,1
COMMENTS
A singly defective permutation omits one value and repeats another value.
LINKS
EXAMPLE
Some solutions for n=3 with 2 maxima:
(1,4,2,3,2) (3,5,1,4,5) (4,1,2,5,2) (3,2,2,4,1) (2,1,4,5,2) (4,4,3,1,2).
CROSSREFS
Column 2 of A183270.
Sequence in context: A011187 A327250 A197248 * A233124 A251694 A355626
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 03 2011
EXTENSIONS
Terms a(14) and beyond from Andrew Howroyd, May 12 2020
STATUS
approved