A152337 Number of permutations of floor(i*5/4), i=0..n-1, with all sums of 4 adjacent terms unique.

1, 2, 6, 24, 120, 640, 3924, 25536, 205708, 1739900, 16259796, 161820114, 1804403590, 21159038910, 264205593296, 3464634505962

Offset

1,2

Links

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

Crossrefs

Sequence in context: A147733 A147732 A147731 * A152338 A152348 A152334

Adjacent sequences: A152334 A152335 A152336 * A152338 A152339 A152340

Keyword

nonn

Author

R. H. Hardin, Dec 02 2008

Status

approved