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A177647
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, down, down, down.
0
1, 1, 70, 34650, 63063000, 303526299000, 3187068420047305, 64239844119903312514
OFFSET
0,3
CROSSREFS
Cf. A014608.
Sequence in context: A177300 A266741 A177646 * A177658 A177670 A177671
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 10 2010
STATUS
approved