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A177278 Number of permutations of 1..n with all adjacent differences <= 6 in absolute value. 0
1, 1, 2, 6, 24, 120, 720, 5040, 30240, 159840, 773040, 3556752, 16068708, 72870932, 336443754, 1563452344, 7255541240, 33461906400, 153007409088, 693538405248 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

a(n) = n! for n<=7.

LINKS

Table of n, a(n) for n=0..19.

CROSSREFS

Cf. A000142.

Sequence in context: A248769 A138113 A045977 * A173847 A154655 A256181

Adjacent sequences:  A177275 A177276 A177277 * A177279 A177280 A177281

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 06 2010

STATUS

approved

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Last modified April 29 15:41 EDT 2016. Contains 272168 sequences.