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A147909
Number of permutations of floor(i*5/2), i=0..n-1, with all sums of 2 through 5 adjacent terms respectively unique.
0
1, 2, 6, 16, 74, 368, 1924, 10496, 65446, 426596, 3048508, 22901328, 189677816, 1628971852, 15211951462, 146663420606
OFFSET
1,2
CROSSREFS
Sequence in context: A147908 A147900 A147892 * A147911 A147901 A147894
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 17 2008
STATUS
approved