A147951 Number of permutations of floor(i*9/7), i=0..n-1, with all sums of 2 through 5 adjacent terms respectively unique.

1, 2, 6, 16, 74, 304, 1424, 7946, 39908, 223514, 1294348, 8736910, 58707788, 401926462, 3287231046, 25868828516

Offset

1,2

Links

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

Crossrefs

Sequence in context: A147910 A147902 A147893 * A147942 A147933 A147886

Adjacent sequences: A147948 A147949 A147950 * A147952 A147953 A147954

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved