A180892 Number of permutations of 4..n+3 with no element greater than or equal to the sum of its neighbors

1, 0, 2, 6, 30, 168, 1078, 7544, 59202, 504340, 4724672, 47582366, 519090056, 6039933544, 75306132788, 994433862242, 13955352735180, 206245134439298

Offset

1,3

Links

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

Crossrefs

Sequence in context: A005432 A009422 A057221 * A366266 A196497 A127115

Adjacent sequences: A180889 A180890 A180891 * A180893 A180894 A180895

Keyword

nonn

Author

R. H. Hardin Sep 23 2010

Status

approved