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A177644
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, up
0
1, 70, 29874, 43724128, 163394718481, 1305717814847931, 19780733910930967382
OFFSET
1,2
CROSSREFS
Sequence in context: A005983 A200313 A177642 * A146499 A177649 A177651
KEYWORD
nonn
AUTHOR
R. H. Hardin May 10 2010
STATUS
approved