A147885 Number of permutations of floor(i*5/2), i=0..n-1, with all sums of two adjacent terms unique.

1, 2, 6, 16, 74, 368, 2016, 12168, 85462, 646544, 5510236, 49722456, 500178548, 5288883744, 60900708056, 733070993472

Offset

1,2

Links

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

Crossrefs

Sequence in context: A147911 A147901 A147894 * A147914 A147905 A147897

Adjacent sequences: A147882 A147883 A147884 * A147886 A147887 A147888

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved