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%I #13 Nov 12 2023 02:53:02
%S 2,2,6,16,34,140,508,2100,9386,44398,214410,1103178,6002116,33772692,
%T 196340714,1190396084,7486976948,48456599516,322526380686,
%U 2215295406072,15651462450174,113259396917170
%N Number of permutations of 1..n with the sum of squared adjacent differences <= n*(n-1)/2.
%Y Cf. A180069.
%K nonn
%O 2,1
%A _R. H. Hardin_, Aug 09 2010
%E a(17)-a(18) from _Donovan Johnson_, Oct 11 2010
%E a(19)-a(23) from _Martin Ehrenstein_, Nov 12 2023
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