A238918 Number of self-inverse permutations p on [n] where the maximal displacement of an element equals 7.

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

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