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A177281
Number of permutations of 1..n with all adjacent differences <= 9 in absolute value.
0
1, 1, 2, 6, 24, 120, 720, 5040, 40320, 362880, 3628800, 32659200, 267805440, 2033498880, 14563332000, 100185340320, 672903217200, 4472291398032, 29721557854116, 199059839989844
OFFSET
0,3
COMMENTS
a(n) = n! for n <= 10.
CROSSREFS
Sequence in context: A319212 A276844 A273697 * A173850 A154658 A179369
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 06 2010
STATUS
approved