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A180893
Number of permutations of 5..n+4 with no element greater than or equal to the sum of its neighbors
0
1, 0, 2, 6, 30, 180, 1200, 8988, 72984, 652062, 6265640, 65368816, 728437140, 8716755900, 110651859874, 1495439437896, 21314983075714, 321259346944130
OFFSET
1,3
CROSSREFS
Sequence in context: A127115 A290354 A293906 * A180894 A180895 A180896
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 23 2010
STATUS
approved