%I #5 Apr 07 2021 19:24:25
%S 1,2,6,16,54,232,936,3880,17302,81584,409012,2138674,11754832,
%T 66857094,399774882,2469567300,15804526682
%N Number of permutations of 1..n with all sums of 2 through 6 adjacent terms respectively unique.
%K nonn
%O 1,2
%A _R. H. Hardin_, Nov 11 2008