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%I #12 Feb 24 2021 02:48:19
%S 0,1,2,2,2,4,4,2,4,6,6,8,6,12,10,6,4,6,10,12,10,14,14,16,16,18,14,16,
%T 12,20,22,8,8,16,18,16,10,16,20,24,26,36,24,32,30,40,28,24
%N Number of L-toothpicks added to the L-toothpick structure of A172308 (First quadrant) at the n-th stage.
%H David Applegate, Omar E. Pol and N. J. A. Sloane, <a href="/A000695/a000695_1.pdf">The Toothpick Sequence and Other Sequences from Cellular Automata</a>, Congressus Numerantium, Vol. 206 (2010), 157-191. [There is a typo in Theorem 6: (13) should read u(n) = 4.3^(wt(n-1)-1) for n >= 2.]
%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>
%F a(0) = 0, a(n) = A172305(n+1)/4, for n>=1.
%Y Cf. First differences of A172308.
%Y Cf. A139250, A139251, A152978, A172304, A172305, A172306, A172307, A172308, A172310, A172311, A172312, A172313.
%K more,nonn
%O 0,3
%A _Omar E. Pol_, Feb 06 2010
%E More terms from _Colin Barker_, Apr 19 2015
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