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A177300
Number of permutations of 4 copies of 1..n with all adjacent differences <= 3 in absolute value.
0
1, 1, 70, 34650, 63063000, 42251309100, 17268436078740, 6595449547140990, 2941134289344290882
OFFSET
0,3
COMMENTS
a(n) = (4n)!/24^n for n<=4.
CROSSREFS
Cf. A014608.
Sequence in context: A177664 A177674 A177675 * A266741 A177646 A177647
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 06 2010
STATUS
approved