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A177561
Number of permutations of 2 copies of 1..n avoiding adjacent step pattern up, down, up, down
0
1, 6, 74, 1730, 62340, 3258982, 232475188, 21711360018, 2576183815724, 378267268113542
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..10.
CROSSREFS
Sequence in context:
A317344
A357011
A231691
*
A269334
A069852
A266574
Adjacent sequences:
A177558
A177559
A177560
*
A177562
A177563
A177564
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 10 2010
STATUS
approved
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Last modified August 18 20:50 EDT 2024. Contains 375284 sequences. (Running on oeis4.)