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A177306
Number of permutations of 6 copies of 1..n with all adjacent differences <= 3 in absolute value.
0
1, 1, 924, 17153136, 2308743493056, 71614356453896256, 1097239851330486263400
OFFSET
0,3
COMMENTS
a(n) = (6n)!/720^n for n<=4.
CROSSREFS
Cf. A248814.
Sequence in context: A351485 A362171 A177305 * A248814 A172558 A229778
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 06 2010
STATUS
approved