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A179957 Number of permutations of 1..n  such that |p(i)-p(i-1)|>= 4 for i>1. 4
1, 1, 0, 0, 0, 0, 0, 0, 2, 72, 1496, 25384, 399848, 6231544, 99133496, 1634227958, 28120703888, 506599465896, 9562489659952, 189055933191880, 3911226769004280 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,9

LINKS

Table of n, a(n) for n=0..20.

CROSSREFS

Sequence in context: A283568 A070775 A157061 * A221549 A289197 A174582

Adjacent sequences:  A179954 A179955 A179956 * A179958 A179959 A179960

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 03 2010

EXTENSIONS

a(0), a(19)-a(20) from Alois P. Heinz, Oct 27 2014

STATUS

approved

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Last modified February 21 03:06 EST 2019. Contains 320364 sequences. (Running on oeis4.)