%I #8 Dec 12 2015 01:47:02
%S 8,56,336,2352,15120,105168,710640,4883424,33384960,228945360,
%T 1568401296,10751253072,73683206688,505043014560
%N Number of length-n 0..7 arrays connected end-around, with no sequence of L<n elements immediately followed by itself (periodic "squarefree").
%C Column 7 of A215228.
%e Some solutions for n=5:
%e ..7....2....0....6....7....7....6....7....3....7....6....0....1....2....5....0
%e ..6....4....5....5....0....5....7....3....1....1....1....1....0....5....6....4
%e ..1....3....6....7....6....7....5....7....5....5....5....2....7....1....3....1
%e ..5....5....2....3....0....1....6....0....0....3....1....6....5....4....5....6
%e ..0....6....1....5....4....4....1....6....4....4....7....7....0....0....7....4
%K nonn,more
%O 1,1
%A _R. H. Hardin_, Aug 06 2012