A147892 Number of permutations of floor(i*3/2), i=0..n-1, with all sums of two and three adjacent terms respectively unique.

1, 2, 6, 16, 74, 368, 1776, 9624, 57916, 365502, 2682244, 20315800, 175739338, 1565766116, 15452316746, 156617881640

Offset

1,2

Links

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

Crossrefs

Sequence in context: A147924 A147908 A147900 * A147909 A147911 A147901

Adjacent sequences: A147889 A147890 A147891 * A147893 A147894 A147895

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved