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%I #5 Apr 07 2021 19:27:00
%S 1,2,6,24,120,720,5040,37440,323520,3312000,34368480,409907904,
%T 5169149280,71094545192,1074493719384
%N Number of permutations of 1..n with all sums of 2 through 2 adjacent terms squared respectively unique.
%K nonn
%O 1,2
%A _R. H. Hardin_, Nov 11 2008