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%I #5 Apr 07 2021 19:24:49
%S 1,2,6,24,120,624,4560,37440,323520,3167616,34387248,397398720,
%T 5179836888,69488212320,1032953884956
%N Number of permutations of 0..n-1 with all sums of 2 through 2 adjacent terms squared respectively unique.
%K nonn
%O 1,2
%A _R. H. Hardin_, Nov 11 2008