A147933 Number of permutations of floor(i*9/7), i=0..n-1, with all sums of two and three adjacent terms respectively unique.

1, 2, 6, 16, 74, 304, 1424, 7946, 44418, 271160, 1760020, 13590836, 107901418, 882093328, 8656696052, 83441646558

Offset

1,2

Links

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

Crossrefs

Sequence in context: A147893 A147951 A147942 * A147886 A147924 A147908

Adjacent sequences: A147930 A147931 A147932 * A147934 A147935 A147936

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved