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A147906 Number of permutations of floor(i*9/5), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique. 0
1, 2, 6, 24, 96, 444, 2508, 13216, 74772, 490758, 3587634, 32230992, 247788878, 2035600526, 18463836692, 192838249056 (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: A334767 A323260 A147915 * A147898 A147890 A147912

Adjacent sequences:  A147903 A147904 A147905 * A147907 A147908 A147909

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 17 2008

STATUS

approved

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Last modified December 2 12:01 EST 2021. Contains 349440 sequences. (Running on oeis4.)