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Number of permutations of 1..n with the sum of squared adjacent differences <= (n-1)*n*(n+1)/6.
1

%I #12 Nov 16 2023 07:15:31

%S 2,2,12,62,384,2574,20432,183790,1833102,20075568,240972780,

%T 3128714960,43794182164,656192916356,10493589363960,178319646743428

%N Number of permutations of 1..n with the sum of squared adjacent differences <= (n-1)*n*(n+1)/6.

%Y Cf. A000292, A180073.

%K nonn,more

%O 2,1

%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