%N a(n) = (A160121(n) - A266533(n))/6.
%C a(n) is 1/6 of the difference between the number of Y-toothpicks added at n-th stage in the structure of A160120 and the number of Y-toothpicks added at n-th stage stage in the structure of A266532 (the outward version of A160120).
%H N. J. A. Sloane, <a href="/wiki/Catalog_of_Toothpick_and_CA_Sequences_in_OEIS">Catalog of Toothpick and Cellular Automata Sequences in the OEIS</a>
%H <a href="/index/Ce#cell">Index entries for sequences related to cellular automata</a>
%H <a href="/index/To#toothpick">Index entries for sequences related to toothpick sequences</a>
%e Written as an irregular triangle in which the row lengths are the terms of A011782 the sequence begins:
%e 0, 0;
%e 0, 0,0,0;
%e 1, 0,0,0,1,0,1,1;
%e 4, 0,0,0,1,0,0,1,4,0,1,1,5,2,4,4;
%e 13, 2,0,0,1,0,1,1,4,0,1,1,5,2,4,4,13,2,1,1,5,2,5,6,16,5,4,4,15,8,13,15;
%Y Cf. A011782, A038573, A160120, A160121, A266532, A266533.
%A _Omar E. Pol_, Jan 19 2016