A180891 Number of permutations of 3..n+2 with no element greater than or equal to the sum of its neighbors

1, 0, 2, 6, 26, 142, 844, 5686, 42114, 349630, 3149222, 31070272, 328873208, 3760018560, 45762031978, 595413789074, 8190755202454, 119517943312606

Offset

1,3

Links

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

Crossrefs

Sequence in context: A009575 A263687 A379085 * A224529 A171151 A177381

Adjacent sequences: A180888 A180889 A180890 * A180892 A180893 A180894

Keyword

nonn

Author

R. H. Hardin Sep 23 2010

Status

approved