A147943 Number of permutations of floor(i*4/3), i=0..n-1, with all sums of 2 through 5 adjacent terms respectively unique.

1, 2, 6, 24, 74, 312, 1620, 7876, 41114, 262142, 1532832, 9946476, 74352024, 512825612, 3896130434, 33601759994

Offset

1,2

Links

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

Crossrefs

Sequence in context: A178847 A173844 A107761 * A147934 A147925 A147917

Adjacent sequences: A147940 A147941 A147942 * A147944 A147945 A147946

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved