%I #5 Apr 07 2021 19:39:15
%S 1,2,6,24,96,444,2508,13216,74772,490758,3587634,32230992,247788878,
%T 2035600526,18463836692,192838249056
%N Number of permutations of floor(i*9/5), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique.
%K nonn
%O 1,2
%A _R. H. Hardin_, Nov 17 2008