A147901 Number of permutations of floor(i*5/2), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique.

1, 2, 6, 16, 74, 368, 1924, 10496, 65446, 426596, 3097668, 23660988, 200784060, 1772606976, 16992756584, 168890555040

Offset

1,2

Links

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

Crossrefs

Sequence in context: A147892 A147909 A147911 * A147894 A147885 A147914

Adjacent sequences: A147898 A147899 A147900 * A147902 A147903 A147904

Keyword

nonn

Author

R. H. Hardin, Nov 17 2008

Status

approved