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A177639
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up.
0
1, 46, 11722, 9659528, 19879855515, 86520373465693, 709390751745167960, 10064485309871565223880
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..8.
CROSSREFS
Sequence in context:
A302114
A159380
A134793
*
A222097
A152501
A209474
Adjacent sequences:
A177636
A177637
A177638
*
A177640
A177641
A177642
KEYWORD
nonn
AUTHOR
R. H. Hardin
, May 10 2010
EXTENSIONS
a(8) from
Alois P. Heinz
, Nov 02 2013
STATUS
approved
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Last modified September 9 06:26 EDT 2024. Contains 375759 sequences. (Running on oeis4.)