A147900 Number of permutations of floor(i*3/2), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique.

1, 2, 6, 16, 74, 368, 1776, 9208, 53466, 314212, 2134376, 14852630, 117199526, 945570742, 8407963796, 76231574308

Offset

1,2

Links

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

Crossrefs

Sequence in context: A147886 A147924 A147908 * A147892 A147909 A147911

Adjacent sequences: A147897 A147898 A147899 * A147901 A147902 A147903

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved