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A152643
Number of permutations of floor(i*9/2), i=0..n-1, with all sums of 7 adjacent terms unique.
0
1, 2, 6, 24, 120, 720, 5040, 40320, 339840, 3151872, 31926528, 352653888, 4226533888, 54936197152, 764592120720, 11371146947248
OFFSET
1,2
CROSSREFS
Sequence in context: A152629 A152631 A152635 * A152638 A152636 A152632
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 10 2008
STATUS
approved