%I #5 Dec 12 2015 16:20:44
%S 1,1,1,3,6,27,99,462,2205,11414,61028,337089,1894854,10794718,
%T 61989059,357903580,2073376576,12037807836
%N Number of lengthn 0..6 arrays connected endaround, with no sequence of L<n elements immediately followed by itself (periodic "squarefree"), and new values introduced in order 0..6.
%C Column 6 of A215401.
%e Some solutions for n=9:
%e ..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
%e ..1....1....1....1....1....1....1....1....1....1....1....1....1....1....1....1
%e ..2....2....2....2....2....2....2....2....2....2....2....2....2....2....2....2
%e ..3....3....3....3....3....3....1....1....1....3....1....1....3....3....3....3
%e ..4....4....4....4....2....4....3....3....3....4....3....3....4....0....1....4
%e ..0....1....5....0....4....1....4....2....4....2....4....1....2....1....2....0
%e ..2....2....0....2....1....5....0....4....3....0....0....4....4....3....4....5
%e ..1....5....4....4....0....4....5....3....1....3....3....0....3....4....5....4
%e ..3....3....6....3....4....5....4....5....4....5....1....5....4....5....1....6
%K nonn
%O 1,4
%A _R. H. Hardin_, Aug 09 2012
