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A147942 Number of permutations of floor(i*9/7), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique. 0
1, 2, 6, 16, 74, 304, 1424, 7946, 39908, 231442, 1351720, 9447558, 67300148, 488187450, 4266438488, 36066619444 (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: A147902 A147893 A147951 * A147933 A147886 A147924

Adjacent sequences:  A147939 A147940 A147941 * A147943 A147944 A147945

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 17 2008

STATUS

approved

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Last modified January 16 22:12 EST 2022. Contains 350376 sequences. (Running on oeis4.)