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%I #5 Apr 07 2021 20:07:40
%S 1,2,6,24,120,640,3924,25536,205708,1739900,16259796,161820114,
%T 1804403590,21159038910,264205593296,3464634505962
%N Number of permutations of floor(i*5/4), i=0..n-1, with all sums of 4 adjacent terms unique.
%K nonn
%O 1,2
%A _R. H. Hardin_, Dec 02 2008