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A147886 Number of permutations of floor(i*5/4), i=0..n-1, with all sums of two adjacent terms unique. 0
1, 2, 6, 16, 74, 304, 1720, 9344, 67650, 496204, 4034008, 33768568, 337582870, 3472186528, 37790639750, 425218900656 (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: A147951 A147942 A147933 * A147924 A147908 A147900

Adjacent sequences:  A147883 A147884 A147885 * A147887 A147888 A147889

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 17 2008

STATUS

approved

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Last modified January 22 07:31 EST 2022. Contains 350481 sequences. (Running on oeis4.)