A147939 Number of permutations of floor(i*8/3), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique.

1, 2, 6, 24, 96, 376, 2214, 13736, 74156, 544746, 4407076, 31351588, 285115742, 2837535876, 24004174902, 263778523564

Offset

1,2

Links

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

Crossrefs

Sequence in context: A147935 A147926 A147948 * A147930 A147918 A072855

Adjacent sequences: A147936 A147937 A147938 * A147940 A147941 A147942

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved