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A177657
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, down, down, down, down.
0
1, 1, 70, 34650, 63063000, 305540235000, 3244612572406800, 66346172137847738628
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OFFSET
0,3
LINKS
Table of n, a(n) for n=0..7.
CROSSREFS
Cf.
A014608
.
Sequence in context:
A177670
A177671
A177656
*
A177676
A014608
A185401
Adjacent sequences:
A177654
A177655
A177656
*
A177658
A177659
A177660
KEYWORD
nonn
AUTHOR
R. H. Hardin
, May 10 2010
STATUS
approved
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Last modified August 22 14:11 EDT 2024. Contains 375369 sequences. (Running on oeis4.)