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A147928 Number of permutations of floor(i*7/3), i=0..n-1, with all sums of two and three adjacent terms respectively unique. 0
1, 2, 6, 24, 74, 368, 2214, 10892, 70136, 578748, 3920958, 33396960, 341266768, 2847640070, 30294332328, 372805397466 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..16.

CROSSREFS

Sequence in context: A147917 A147946 A147937 * A147920 A147947 A147938

Adjacent sequences:  A147925 A147926 A147927 * A147929 A147930 A147931

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 17 2008

STATUS

approved

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Last modified August 16 15:19 EDT 2022. Contains 356168 sequences. (Running on oeis4.)