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A239081 Number of self-inverse permutations p on [n] with displacement of elements restricted by 9: |p(i)-i| <= 9. 2
1, 1, 2, 4, 10, 26, 76, 232, 764, 2620, 9496, 33076, 112428, 372436, 1214976, 3913582, 12529522, 39989374, 127728664, 409169795, 1317486613, 4256424244, 13780938480, 44667060684, 144831314468, 469535390016, 1521506451968, 4927356770176, 15947637013296 (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=9 of A238888.

Cf. A000085.

Sequence in context: A007580 A239080 A212915 * A212916 A239082 A229053

Adjacent sequences:  A239078 A239079 A239080 * A239082 A239083 A239084

KEYWORD

nonn

AUTHOR

Joerg Arndt and Alois P. Heinz, Mar 10 2014

STATUS

approved

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Last modified August 20 20:50 EDT 2019. Contains 326155 sequences. (Running on oeis4.)