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%I #6 Dec 01 2018 19:29:47
%S 1,1,0,0,0,0,0,0,0,0,0,0,0,0,2,768,98408,6433728,305193408,
%T 11902581120,412583686272
%N Number of permutations of 1..n with no adjacent elements within 6 in value.
%K nonn
%O 0,15
%A _R. H. Hardin_, Aug 03 2010
%E a(0)-a(12), a(20) from _Alois P. Heinz_, Dec 01 2018