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A147899 Number of permutations of floor(i*9/8), i=0..n-1, with all sums of two and three adjacent terms respectively unique. 0
1, 2, 6, 16, 54, 232, 936, 4136, 25518, 153608, 989110, 6834648, 49015240, 365663988, 2898743824, 24274925344 (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: A147916 A147907 A147634 * A147949 A147940 A147931

Adjacent sequences:  A147896 A147897 A147898 * A147900 A147901 A147902

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 17 2008

STATUS

approved

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Last modified December 4 13:06 EST 2021. Contains 349526 sequences. (Running on oeis4.)