A180891 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A180891

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

%I #2 Mar 31 2012 12:35:48

%S 1,0,2,6,26,142,844,5686,42114,349630,3149222,31070272,328873208,

%T 3760018560,45762031978,595413789074,8190755202454,119517943312606

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

%K nonn

%O 1,3

%A _R. H. Hardin_ Sep 23 2010