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A177614
Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, up, down, up, up
0
1, 20, 1657, 352228, 152954196, 118201230707, 148140760913064, 281601795477345111
OFFSET
1,2
CROSSREFS
Sequence in context: A177626 A177609 A094035 * A177622 A177627 A177620
KEYWORD
nonn
AUTHOR
R. H. Hardin May 10 2010
STATUS
approved