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A177658
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, down, down, down, up.
0
1, 1, 70, 34650, 63063000, 304028985024, 3200982922029530, 64736431797158097635
OFFSET
0,3
CROSSREFS
Cf. A014608.
Sequence in context: A266741 A177646 A177647 * A177670 A177671 A177656
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 10 2010
STATUS
approved