A152335 Number of permutations of floor(i*5/2), i=0..n-1, with all sums of 4 adjacent terms unique.

1, 2, 6, 24, 120, 640, 4164, 28224, 237168, 2133992, 21136148, 226558932, 2656690332, 33144866692, 444798029884, 6309964631348

Offset

1,2

Links

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

Crossrefs

Sequence in context: A152348 A152334 A152333 * A152339 A152341 A152346

Adjacent sequences: A152332 A152333 A152334 * A152336 A152337 A152338

Keyword

nonn

Author

R. H. Hardin, Dec 02 2008

Status

approved