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A239080 Number of self-inverse permutations p on [n] with displacement of elements restricted by 8: |p(i)-i| <= 8. 2
1, 1, 2, 4, 10, 26, 76, 232, 764, 2620, 8732, 28068, 88448, 273590, 839026, 2559590, 7810344, 23899859, 73552737, 227149812, 702978992, 2177474284, 6745619532, 20888771872, 64643999584, 199916632224, 617935452464, 1909553806592, 5900616453456, 18234154867712 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Joerg Arndt and Alois P. Heinz, Table of n, a(n) for n = 0..1000

CROSSREFS

Column k=8 of A238888.

Cf. A000085.

Sequence in context: A007578 A239079 A007580 * A212915 A239081 A212916

Adjacent sequences:  A239077 A239078 A239079 * A239081 A239082 A239083

KEYWORD

nonn

AUTHOR

Joerg Arndt and Alois P. Heinz, Mar 10 2014

STATUS

approved

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Last modified February 20 04:19 EST 2018. Contains 299358 sequences. (Running on oeis4.)