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A177659
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, down, down, up, down
0
1, 70, 34650, 61936740, 290927564416, 2971394893453510, 58139421887847131772
OFFSET
1,2
CROSSREFS
Sequence in context: A177641 A177648 A177653 * A177665 A177654 A177660
KEYWORD
nonn
AUTHOR
R. H. Hardin May 10 2010
STATUS
approved