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A177675
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, up, up, down, down, down
0
1, 70, 34650, 62987418, 303953291280, 3208757131366020, 65143699363358402128
OFFSET
1,2
CROSSREFS
Sequence in context: A177660 A177664 A177674 * A177300 A266741 A177646
KEYWORD
nonn
AUTHOR
R. H. Hardin May 10 2010
STATUS
approved