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A147893 Number of permutations of floor(i*5/4), i=0..n-1, with all sums of two and three adjacent terms respectively unique. 0
1, 2, 6, 16, 74, 304, 1424, 6922, 40922, 250670, 1645304, 11152882, 92183062, 780194356, 6842821428, 61855909454 (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: A114249 A147910 A147902 * A147951 A147942 A147933

Adjacent sequences:  A147890 A147891 A147892 * A147894 A147895 A147896

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 17 2008

STATUS

approved

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Last modified January 26 16:03 EST 2022. Contains 350599 sequences. (Running on oeis4.)