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A147920 Number of permutations of floor(i*7/3), i=0..n-1, with all sums of two adjacent terms unique. 0
1, 2, 6, 24, 74, 368, 2434, 12876, 95120, 838244, 6232926, 59671520, 674514660, 6450680100, 77573342320, 1056425822904 (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: A147946 A147937 A147928 * A147947 A147938 A147929

Adjacent sequences:  A147917 A147918 A147919 * A147921 A147922 A147923

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 17 2008

STATUS

approved

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Last modified July 6 12:26 EDT 2022. Contains 355110 sequences. (Running on oeis4.)