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A147890
Number of permutations of floor(i*9/5), i=0..n-1, with all sums of two adjacent terms unique.
0
1, 2, 6, 24, 96, 444, 3172, 16976, 112790, 839320, 7525858, 86947336, 816752748, 8170308628, 90956874778, 1199823762964
OFFSET
1,2
CROSSREFS
Sequence in context: A147915 A147906 A147898 * A147912 A147903 A147895
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 17 2008
STATUS
approved