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A147917 Number of permutations of floor(i*4/3), i=0..n-1, with all sums of two adjacent terms unique. 0
1, 2, 6, 24, 74, 368, 2140, 11468, 78848, 636700, 4866484, 43893944, 452631554, 4475626268, 50128776656, 625960035472 (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: A147943 A147934 A147925 * A147946 A147937 A147928

Adjacent sequences:  A147914 A147915 A147916 * A147918 A147919 A147920

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 17 2008

STATUS

approved

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Last modified July 24 13:45 EDT 2014. Contains 244893 sequences.