A152347 Number of permutations of floor(i*9/5), i=0..n-1, with all sums of 4 adjacent terms unique.

1, 2, 6, 24, 120, 672, 4272, 31824, 246996, 2149932, 21512542, 230751100, 2628119680, 32389604418, 427534335774, 6095015439840

Offset

1,2

Links

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

Crossrefs

Sequence in context: A189256 A152344 A152340 * A228393 A177526 A214611

Adjacent sequences: A152344 A152345 A152346 * A152348 A152349 A152350

Keyword

nonn

Author

R. H. Hardin, Dec 02 2008

Status

approved