A152644 Number of permutations of floor(i*9/4), i=0..n-1, with all sums of 7 adjacent terms unique.

1, 2, 6, 24, 120, 720, 5040, 40320, 343680, 3210336, 32428512, 359501856, 4409024192, 56394389456, 777561149096, 11557514999280

Offset

1,2

Links

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

Crossrefs

Sequence in context: A152632 A152640 A152641 * A152637 A152645 A360386

Adjacent sequences: A152641 A152642 A152643 * A152645 A152646 A152647

Keyword

nonn

Author

R. H. Hardin, Dec 10 2008

Status

approved