A321050 Number of permutations of [n] with no fixed points where the maximal displacement of an element equals four.

0, 20, 111, 396, 1285, 4312, 15437, 55572, 196288, 678270, 2311191, 7856610, 26732463, 90996552, 309390463, 1049670138, 3554983881, 12027825752, 40676758809, 137534141216, 464908099716, 1571078027012, 5307751810223, 17928124690902, 60548310641344

Offset

4,2

Links

Alois P. Heinz, Table of n, a(n) for n = 4..1000

Formula

a(n) = A259777(n) - A079997(n).

Crossrefs

Column k=4 of A259784.

Cf. A079997, A259777.

Sequence in context: A309781 A228243 A086605 * A107837 A267843 A271494

Adjacent sequences: A321047 A321048 A321049 * A321051 A321052 A321053

Keyword

nonn,easy

Author

Alois P. Heinz, Oct 26 2018

Status

approved