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A177671
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, up, down, down, down, down.
0
1, 1, 70, 34650, 63063000, 304935162828, 3227357965784040, 65712161060921061615
OFFSET
0,3
CROSSREFS
Cf. A014608.
Sequence in context: A177647 A177658 A177670 * A177656 A177657 A177676
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 10 2010
STATUS
approved