A147936 Number of permutations of floor(i*6/5), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique.

1, 2, 6, 16, 54, 260, 1236, 6360, 31636, 166080, 1095490, 6861468, 47125320, 327177196, 2371069132, 20747895710

Offset

1,2

Links

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

Crossrefs

Sequence in context: A147896 A147888 A147945 * A147927 A147919 A320805

Adjacent sequences: A147933 A147934 A147935 * A147937 A147938 A147939

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved