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Number of permutations of 1..n with all sums of 2 through 4 adjacent terms respectively unique.
0

%I #5 Apr 07 2021 19:24:09

%S 1,2,6,16,54,232,936,3880,17302,81584,425550,2332858,13639774,

%T 84416970,555549406,3834425860,27937916790

%N Number of permutations of 1..n with all sums of 2 through 4 adjacent terms respectively unique.

%K nonn

%O 1,2

%A _R. H. Hardin_, Nov 11 2008