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A177673
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, up, down, up, down, down.
0
1, 70, 34290, 60635566, 281746189372, 2845828778331540, 55049107499751379058
OFFSET
1,2
CROSSREFS
Sequence in context: A177655 A177663 A177668 * A177661 A177672 A177299
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 10 2010
STATUS
approved