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Number of length-n 0..2 arrays connected end-around, with no sequence of L<n elements immediately followed by itself (periodic "squarefree"), and new values introduced in order 0..2.
0

%I #5 Dec 12 2015 16:19:40

%S 1,1,1,2,0,3,0,4,0,0,11,12,13,0,5,8,0,42,38,50,7,77,115,120,125,117,

%T 135,210,348,645,837,928,792,986

%N Number of length-n 0..2 arrays connected end-around, with no sequence of L<n elements immediately followed by itself (periodic "squarefree"), and new values introduced in order 0..2.

%C Column 2 of A215401.

%e All solutions for n=6:

%e ..0....0....0

%e ..1....1....1

%e ..2....0....2

%e ..1....2....0

%e ..0....1....2

%e ..2....2....1

%K nonn

%O 1,4

%A _R. H. Hardin_, Aug 09 2012