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A177661
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, down, up, down, down
0
1, 70, 34302, 60601152, 281381782044, 2841788674410678, 54998505166544652117
OFFSET
1,2
CROSSREFS
Sequence in context: A177663 A177668 A177673 * A177672 A177299 A266740
KEYWORD
nonn
AUTHOR
R. H. Hardin May 10 2010
STATUS
approved