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A147925 Number of permutations of floor(i*4/3), i=0..n-1, with all sums of two and three adjacent terms respectively unique. 0
1, 2, 6, 24, 74, 312, 1620, 7876, 44022, 307314, 2064562, 15229866, 132064084, 1095500280, 10006003984, 104500649736 (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: A107761 A147943 A147934 * A147917 A147946 A147937

Adjacent sequences:  A147922 A147923 A147924 * A147926 A147927 A147928

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 17 2008

STATUS

approved

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Last modified August 12 22:46 EDT 2022. Contains 356077 sequences. (Running on oeis4.)