A147887 Number of permutations of floor(i*7/4), i=0..n-1, with all sums of two adjacent terms unique.

1, 2, 6, 24, 96, 528, 2418, 14676, 109882, 996240, 7675118, 67181516, 718155492, 8798220008, 93512144280, 1080953807952

Offset

1,2

Links

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

Crossrefs

Sequence in context: A152314 A152331 A152324 * A053502 A053504 A215716

Adjacent sequences: A147884 A147885 A147886 * A147888 A147889 A147890

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved