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A209326
Number of permutations of [n] with a fixed point but no succession.
2
0, 1, 0, 3, 7, 39, 207, 1437, 11203, 99041, 975645, 10601377, 125905445, 1622349059, 22539777113, 335845307359, 5341990288103, 90340567900583, 1618553943500599, 30623660893656205, 610152486797080443, 12769086757046132625
OFFSET
0,4
COMMENTS
A succession of a permutation p is a position i such that p(i+1)-p(i) = 1.
EXAMPLE
For n=4 we have 1324, 1432, 2431, 3214, 3241, 4132 and 4213.
KEYWORD
nonn,more
AUTHOR
Jon Perry, Jan 19 2013
EXTENSIONS
a(11)-a(14) from Alois P. Heinz, Jan 20 2013
a(15)-a(21) from Alois P. Heinz, Jul 04 2021
STATUS
approved