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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
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OFFSET
0,3
LINKS
Table of n, a(n) for n=0..7.
CROSSREFS
Cf.
A014608
.
Sequence in context:
A177300
A266741
A177646
*
A177658
A177670
A177671
Adjacent sequences:
A177644
A177645
A177646
*
A177648
A177649
A177650
KEYWORD
nonn
AUTHOR
R. H. Hardin
, May 10 2010
STATUS
approved
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Last modified August 22 20:40 EDT 2024. Contains 375369 sequences. (Running on oeis4.)