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%I #16 Sep 26 2015 01:17:13
%S 0,1,1,1,3,1,3,3,3,5,3,5,7,1,3,3,5,9,5,13,7,9,13,7,11,13,3,7,7,9,15,
%T 11,21,15,15,17,11,13,15,15,15,9,11,19,13,21,21,17,17,23,17,27,17,19,
%U 27,21,27,19,17,17,21,31,31,25,23
%N Number of E-toothpicks added at n-th stage in the structure of A161336.
%C Essentially the first differences of A161336.
%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/To#toothpick">Index entries for sequences related to toothpick sequences</a>
%F a(n) = A161331(n+1)/6, n >= 1.
%Y Cf. A139250, A139251, A161328, A161330, A213360, A211976.
%K nonn
%O 0,5
%A _Omar E. Pol_, Dec 15 2012
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