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A177562
Number of permutations of 2 copies of 1..n avoiding adjacent step pattern up, down, up, up
0
1, 6, 84, 2123, 84034, 4804627, 375435365, 38463186965, 5004563283887, 806386210926308
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..10.
CROSSREFS
Sequence in context:
A123312
A010794
A177560
*
A273935
A318399
A171200
Adjacent sequences:
A177559
A177560
A177561
*
A177563
A177564
A177565
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.)