A180896 Number of permutations of 8..n+7 with no element greater than or equal to the sum of its neighbors

1, 0, 2, 6, 30, 180, 1260, 10080, 90720, 887040, 9432360, 107012160, 1300448160, 16716051384, 228160919040, 3276565988040, 49664631128706, 788840324793320

Offset

1,3

Links

Table of n, a(n) for n=1..18.

Crossrefs

Sequence in context: A180893 A180894 A180895 * A180897 A353184 A096769

Adjacent sequences: A180893 A180894 A180895 * A180897 A180898 A180899

Keyword

nonn

Author

R. H. Hardin Sep 23 2010

Status

approved