A152643 Number of permutations of floor(i*9/2), i=0..n-1, with all sums of 7 adjacent terms unique.

1, 2, 6, 24, 120, 720, 5040, 40320, 339840, 3151872, 31926528, 352653888, 4226533888, 54936197152, 764592120720, 11371146947248

Offset

1,2

Links

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

Crossrefs

Sequence in context: A152629 A152631 A152635 * A152638 A152636 A152632

Adjacent sequences: A152640 A152641 A152642 * A152644 A152645 A152646

Keyword

nonn

Author

R. H. Hardin, Dec 10 2008

Status

approved