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%I #10 Nov 16 2023 07:15:44
%S 0,2,12,56,344,2486,19936,179772,1800566,19867748,238718608,
%T 3105919304,43474755484,652732780048,10446585803476,177631436657888
%N Number of permutations of 1..n with the sum of squared adjacent differences < (n-1)*n*(n+1)/6.
%Y Cf. A000292, A180072.
%K nonn
%O 2,2
%A _R. H. Hardin_, Aug 09 2010
%E a(14) from _Donovan Johnson_, Oct 11 2010
%E a(15)-a(17) from _Martin Ehrenstein_, Nov 16 2023