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Number of permutations of 1..n with the sum of squared adjacent differences < n*(n-1)/2
1

%I #13 Nov 12 2023 02:52:57

%S 0,2,2,6,34,132,448,1986,8422,39902,195946,1024366,5505428,31185644,

%T 183904498,1119250852,7025176096,45663175776,306194071810,

%U 2107066845486,14874884490258,107949634637898

%N Number of permutations of 1..n with the sum of squared adjacent differences < n*(n-1)/2

%Y Cf. A180068.

%K nonn

%O 2,2

%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