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A177674
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, up, down, up, up, up
0
1, 70, 34650, 62762200, 301052578040, 3154731367686570, 63520913228252004621
OFFSET
1,2
CROSSREFS
Sequence in context: A177654 A177660 A177664 * A177675 A177300 A266741
KEYWORD
nonn
AUTHOR
R. H. Hardin May 10 2010
STATUS
approved