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A177305
Number of permutations of 6 copies of 1..n with all adjacent differences <= 2 in absolute value.
0
1, 1, 924, 17153136, 47768769048, 83659800759150, 202929004783993742
OFFSET
0,3
COMMENTS
a(n) = (6n)!/720^n for n<=3.
CROSSREFS
Cf. A248814.
Sequence in context: A179715 A351485 A362171 * A177306 A248814 A172558
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 06 2010
STATUS
approved