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A238918 Number of self-inverse permutations p on [n] where the maximal displacement of an element equals 7. 2
0, 0, 0, 0, 0, 0, 0, 0, 76, 438, 1846, 6664, 22322, 71223, 221747, 685899, 2133273, 6639848, 20631028, 63857132, 196698620, 602652416, 1837237916, 5577247428, 16876196404, 50936285192, 153419520771, 461274617487, 1384650408582, 4150200289940, 12421725164955 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,9

LINKS

Joerg Arndt and Alois P. Heinz, Table of n, a(n) for n = 0..750

EXAMPLE

a(8) = 76: 82345671, 82345761, 82346571, 82347651, ..., 87543621, 87563421, 87645321, 87654321.

CROSSREFS

Column k=7 of A238889.

Sequence in context: A234177 A205926 A205919 * A234786 A234779 A264475

Adjacent sequences:  A238915 A238916 A238917 * A238919 A238920 A238921

KEYWORD

nonn

AUTHOR

Joerg Arndt and Alois P. Heinz, Mar 07 2014

STATUS

approved

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Last modified January 21 23:44 EST 2022. Contains 350481 sequences. (Running on oeis4.)