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A321050
Number of permutations of [n] with no fixed points where the maximal displacement of an element equals four.
2
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
FORMULA
a(n) = A259777(n) - A079997(n).
CROSSREFS
Column k=4 of A259784.
Sequence in context: A309781 A228243 A086605 * A107837 A267843 A271494
KEYWORD
nonn,easy
AUTHOR
Alois P. Heinz, Oct 26 2018
STATUS
approved