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A177670
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, up, up, up.
0
1, 1, 70, 34650, 63063000, 304532310180, 3216303433012890, 65316931455144717352
OFFSET
0,3
CROSSREFS
Cf. A014608.
Sequence in context: A177646 A177647 A177658 * A177671 A177656 A177657
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 10 2010
STATUS
approved