%I #5 Apr 07 2021 19:25:21
%S 1,2,6,24,96,444,3172,16976,112790,839320,7525858,86947336,816752748,
%T 8170308628,90956874778,1199823762964
%N Number of permutations of floor(i*9/5), i=0..n-1, with all sums of two adjacent terms unique.
%K nonn
%O 1,2
%A _R. H. Hardin_, Nov 17 2008