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A180071 Number of permutations of {1..n} with the sum of squared adjacent differences < n*(n+1)/2. 1

%I

%S 0,1,2,6,12,24,98,344,1236,5332,23772,110962,547714,2840028,15439466,

%T 87299850,512569668,3111575102,19577613014,127331688104

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

%Y Cf. A180070.

%K nonn,hard,more

%O 0,3

%A _R. H. Hardin_, Aug 09 2010

%E a(17)-a(18) from _Donovan Johnson_, Oct 11 2010

%E a(19) from _Bert Dobbelaere_, Aug 31 2020

%E a(0)-a(1) from _Alois P. Heinz_, Sep 02 2020

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Last modified April 21 17:36 EDT 2021. Contains 343156 sequences. (Running on oeis4.)