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A180897
Number of permutations of 9..n+8 with no element greater than or equal to the sum of its neighbors
0
1, 0, 2, 6, 30, 180, 1260, 10080, 90720, 907200, 9797760, 114287040, 1416703680, 18712086480, 260499022680, 3833521421760, 59158317014280, 959784091498944
OFFSET
1,3
CROSSREFS
Sequence in context: A180894 A180895 A180896 * A353184 A096769 A365975
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 23 2010
STATUS
approved