A147904 Number of permutations of floor(i*7/6), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique.

1, 2, 6, 16, 54, 232, 1194, 5348, 28874, 153508, 860486, 4887496, 36291722, 265127656, 2037271658, 15840444682

Offset

1,2

Links

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

Crossrefs

Sequence in context: A147891 A147922 A147913 * A147896 A147888 A147945

Adjacent sequences: A147901 A147902 A147903 * A147905 A147906 A147907

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved