A180884 Number of permutations p() of 1..n+7 with centered difference p(i+1)-p(i-1) < 0 exactly 6 times.

70, 4662, 203616, 5517204, 116189304, 1997701992, 29868078240, 398942612640, 4892905415970, 55931879316170, 604691896711760, 6237809698157180, 61935775158718032, 595207094582803248, 5567411131221296448

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n=1..100

Prog

(bc) /* See A180887 */

Crossrefs

Column 7 of A180887.

Sequence in context: A258374 A363297 A146349 * A238540 A060057 A363296

Adjacent sequences: A180881 A180882 A180883 * A180885 A180886 A180887

Keyword

nonn

Author

R. H. Hardin, Sep 23 2010

Status

approved