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A183267
Number of singly defective permutations of 1..n+6 with exactly 4 maxima.
2
4760, 199168, 4643712, 80506880, 1163431808, 14874150912, 174293203968, 1915121868800, 20041282099200, 201949448765440, 1975285587312640, 18866258297487360, 176760773333450752, 1630252849810636800, 14841729785246515200, 133664316735891701760, 1192882240528106127360
OFFSET
1,1
COMMENTS
A singly defective permutation omits one value and repeats another value.
LINKS
EXAMPLE
Some solutions for n=2 with 4 maxima:
(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).
CROSSREFS
Column 4 of A183270.
Sequence in context: A083638 A237553 A250467 * A258231 A257763 A260293
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 03 2011
EXTENSIONS
Terms a(10) and beyond from Andrew Howroyd, May 12 2020
STATUS
approved