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A177672
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, up, down, down, up, up
0
1, 70, 34470, 61633118, 290404848165, 2980163520882356, 58650349023599896052
OFFSET
1,2
CROSSREFS
Sequence in context: A177668 A177673 A177661 * A177299 A266740 A177640
KEYWORD
nonn
AUTHOR
R. H. Hardin May 10 2010
STATUS
approved