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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
OFFSET
1,2
CROSSREFS
Sequence in context: A334767 A323260 A147915 * A147898 A147890 A147912
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 17 2008
STATUS
approved