login
Number of length-n 0..7 arrays connected end-around, with no sequence of L<n elements immediately followed by itself (periodic "squarefree").
0

%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