A147891 Number of permutations of floor(i*9/8), i=0..n-1, with all sums of two adjacent terms unique.

1, 2, 6, 16, 54, 232, 1132, 6024, 45310, 336372, 2763524, 23390652, 212922998, 2023344980, 20591028914, 219965702000

Offset

1,2

Links

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

Crossrefs

Sequence in context: A147940 A147931 A091217 * A147922 A147913 A147904

Adjacent sequences: A147888 A147889 A147890 * A147892 A147893 A147894

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved