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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
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..7.
CROSSREFS
Sequence in context:
A005983
A200313
A177642
*
A146499
A177649
A177651
Adjacent sequences:
A177641
A177642
A177643
*
A177645
A177646
A177647
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 10 2010
STATUS
approved
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Last modified July 21 09:38 EDT 2024. Contains 374472 sequences. (Running on oeis4.)