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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, 3120781544064
OFFSET
0,3
COMMENTS
a(n) = n! for n <= 7.
CROSSREFS
Cf. A000142.
Sequence in context: A273694 A138113 A045977 * A173847 A154655 A256181
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 06 2010
EXTENSIONS
a(20) from Alois P. Heinz, Apr 04 2019
STATUS
approved