A239079 Number of self-inverse permutations p on [n] with displacement of elements restricted by 7: |p(i)-i| <= 7.

1, 1, 2, 4, 10, 26, 76, 232, 764, 2388, 7280, 21574, 63162, 183286, 531576, 1545583, 4523049, 13283748, 39091824, 115105436, 338866164, 996931680, 2930722336, 8610252768, 25290067376, 74279609504, 218185834860, 640968565724, 1883199406468, 5533359251576

Offset

0,3

Links

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

Crossrefs

Column k=7 of A238888.

Cf. A000085.

Sequence in context: A007123 A220871 A007578 * A007580 A239080 A212915

Adjacent sequences: A239076 A239077 A239078 * A239080 A239081 A239082

Keyword

nonn

Author

Joerg Arndt and Alois P. Heinz, Mar 10 2014

Status

approved