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A177649
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, down, up, down
0
1, 70, 31830, 50395146, 205822250572, 1808558575291438, 30242498188745996934
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..7.
CROSSREFS
Sequence in context:
A177642
A177644
A146499
*
A177651
A177645
A177662
Adjacent sequences:
A177646
A177647
A177648
*
A177650
A177651
A177652
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 10 2010
STATUS
approved
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Last modified August 23 03:25 EDT 2024. Contains 375375 sequences. (Running on oeis4.)