A183267 Number of singly defective permutations of 1..n+6 with exactly 4 maxima.

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

Andrew Howroyd, Table of n, a(n) for n = 1..200

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

Adjacent sequences: A183264 A183265 A183266 * A183268 A183269 A183270

Keyword

nonn

Author

R. H. Hardin, Jan 03 2011

Extensions

Terms a(10) and beyond from Andrew Howroyd, May 12 2020

Status

approved