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A177653
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, up, up
0
1, 70, 34650, 61414332, 285103911731, 2872521312372990, 55380493659302772963
OFFSET
1,2
CROSSREFS
Sequence in context: A177640 A177641 A177648 * A177659 A177665 A177654
KEYWORD
nonn
AUTHOR
R. H. Hardin May 10 2010
STATUS
approved