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A177654
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, up, down, down, down
0
1, 70, 34650, 62234190, 293951256700, 3019523592165814, 59424738039571181776
OFFSET
1,2
CROSSREFS
Sequence in context: A177653 A177659 A177665 * A177660 A177664 A177674
KEYWORD
nonn
AUTHOR
R. H. Hardin May 10 2010
STATUS
approved