A147886 Number of permutations of floor(i*5/4), i=0..n-1, with all sums of two adjacent terms unique.

1, 2, 6, 16, 74, 304, 1720, 9344, 67650, 496204, 4034008, 33768568, 337582870, 3472186528, 37790639750, 425218900656

Offset

1,2

Links

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

Crossrefs

Sequence in context: A147951 A147942 A147933 * A147924 A147908 A147900

Adjacent sequences: A147883 A147884 A147885 * A147887 A147888 A147889

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved