A147940 Number of permutations of floor(i*8/7), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique.

1, 2, 6, 16, 54, 232, 936, 5070, 25700, 144538, 829398, 4949114, 30028194, 195791072, 1612860652, 13023036794

Offset

1,2

Links

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

Crossrefs

Sequence in context: A147634 A147899 A147949 * A147931 A091217 A147891

Adjacent sequences: A147937 A147938 A147939 * A147941 A147942 A147943

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved