A180888 - OEIS

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

%S 1,0,0,0,8,24,80,504,4600,36176,304888,2842472,29790752,331382672,

%T 3962130640,50186636768,680693513480

%N Number of permutations of 0..n-1 with no element greater than or equal to the sum of its neighbors

%e All solutions for n=5

%e (0 1 2 4 3) (0 1 3 4 2) (0 2 4 3 1) (0 3 4 2 1)

%e (1 2 4 3 0) (1 3 4 2 0) (2 4 3 1 0) (3 4 2 1 0)

%K nonn

%O 1,5

%A _R. H. Hardin_ Sep 23 2010