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A177612
Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, up, up, up.
0
1, 1, 20, 1680, 362082, 159459279, 124951069219, 158754672447498, 305860462403616044
OFFSET
0,3
CROSSREFS
Cf. A014606.
Sequence in context: A177599 A177600 A177607 * A177618 A177624 A177613
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 10 2010
STATUS
approved