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A151601
Number of permutations of 4 indistinguishable copies of 1..n arranged in a circle with exactly 6 adjacent element pairs in decreasing order.
0
0, 3348, 20944448, 15679525340, 5314573995408, 1226608986189748
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OFFSET
2,2
LINKS
Table of n, a(n) for n=2..7.
CROSSREFS
Sequence in context:
A255731
A204884
A204880
*
A251817
A216488
A203782
Adjacent sequences:
A151598
A151599
A151600
*
A151602
A151603
A151604
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 21 2009
STATUS
approved
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Last modified September 16 22:04 EDT 2024. Contains 375979 sequences. (Running on oeis4.)