A147897 Number of permutations of floor(i*8/5), i=0..n-1, with all sums of two and three adjacent terms respectively unique.

1, 2, 6, 16, 74, 384, 1970, 10998, 71488, 465816, 3856840, 30115550, 249292568, 2424016580, 22710804768, 264711365708

Offset

1,2

Links

Table of n, a(n) for n=1..16.

Crossrefs

Sequence in context: A147885 A147914 A147905 * A147889 A345246 A137858

Adjacent sequences: A147894 A147895 A147896 * A147898 A147899 A147900

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved