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A147903
Number of permutations of floor(i*7/4), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique.
0
1, 2, 6, 24, 96, 456, 2134, 11650, 74546, 530962, 3437002, 24793292, 214741200, 2028628716, 17460401888, 162168439452
OFFSET
1,2
CROSSREFS
Sequence in context: A147898 A147890 A147912 * A147895 A070945 A152320
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 17 2008
STATUS
approved