A152334 Number of permutations of floor(i*4/3), i=0..n-1, with all sums of 4 adjacent terms unique.

1, 2, 6, 24, 120, 640, 3936, 28800, 221000, 1890260, 17757658, 178522700, 1984189170, 23487665246, 293589788564, 3987487236438

Offset

1,2

Links

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

Crossrefs

Sequence in context: A152337 A152338 A152348 * A152333 A152335 A152339

Adjacent sequences: A152331 A152332 A152333 * A152335 A152336 A152337

Keyword

nonn

Author

R. H. Hardin, Dec 02 2008

Status

approved