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A147941 Number of permutations of floor(i*9/4), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique. 0
1, 2, 6, 16, 96, 376, 1924, 10496, 84546, 522100, 3532332, 28645680, 292372132, 2430262092, 21376627926, 227599952694 (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: A204436 A135068 A147950 * A147932 A147923 A341838

Adjacent sequences:  A147938 A147939 A147940 * A147942 A147943 A147944

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 17 2008

STATUS

approved

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Last modified May 20 15:14 EDT 2022. Contains 353874 sequences. (Running on oeis4.)