%I

%S 1,2,6,16,74,368,2016,12168,85462,646544,5510236,49722456,500178548,

%T 5288883744,60900708056,733070993472

%N Number of permutations of floor(i*5/2), i=0..n-1, with all sums of two adjacent terms unique.

%K nonn

%O 1,2

%A _R. H. Hardin_, Nov 17 2008