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A177569
Number of permutations of 2 copies of 1..n avoiding adjacent step pattern up, down, up, down, down
0
1, 6, 88, 2328, 96960, 5846821, 481944258, 52084697975, 7147002322581, 1214148768638010
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..10.
CROSSREFS
Sequence in context:
A218260
A177567
A177563
*
A327645
A309165
A127183
Adjacent sequences:
A177566
A177567
A177568
*
A177570
A177571
A177572
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 10 2010
STATUS
approved
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Last modified March 29 09:44 EDT 2024. Contains 371268 sequences. (Running on oeis4.)