A180892 - OEIS

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A180892 - OEIS

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A180892

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

0

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

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OFFSET

1,3

LINKS

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

CROSSREFS

Sequence in context: A009422 A057221 A377065 * A366266 A196497 A127115

Adjacent sequences: A180889 A180890 A180891 * A180893 A180894 A180895

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 23 2010

STATUS

approved