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A152348
Number of permutations of floor(i*9/7), i=0..n-1, with all sums of 4 adjacent terms unique.
0
1, 2, 6, 24, 120, 640, 3924, 28656, 211984, 1841052, 16619224, 170244216, 1872923892, 21777129140, 280485621020, 3762640368156
OFFSET
1,2
CROSSREFS
Sequence in context: A147731 A152337 A152338 * A152334 A152333 A152335
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 02 2008
STATUS
approved