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

Author

Joerg Arndt and Alois P. Heinz, Mar 07 2014

Keywords

• nonn

Examples

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

Links

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

Crossrefs

Column k=7 of A238889.