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A177603
Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, up, up
0
1, 20, 1506, 281943, 105629113, 69583938263, 73781411431903, 118056997361635333
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..8.
CROSSREFS
Sequence in context:
A193309
A177601
A200900
*
A160308
A177625
A203481
Adjacent sequences:
A177600
A177601
A177602
*
A177604
A177605
A177606
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 10 2010
STATUS
approved
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Last modified April 25 03:15 EDT 2024. Contains 371964 sequences. (Running on oeis4.)