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A177652
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, down, up
0
1, 65, 27707, 41243158, 159108376040, 1325880163281871, 21089698925887652590
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..7.
CROSSREFS
Sequence in context:
A355469
A084225
A278550
*
A278795
A289946
A219564
Adjacent sequences:
A177649
A177650
A177651
*
A177653
A177654
A177655
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.)