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%I #7 Feb 24 2021 02:48:18
%S 0,2,4,8,8,8,12,28,16,8,12,28,20,28,40,88,32,8,12,28,20,28,40,88,36,
%T 28,40,88,56,92,140,256,64,8,12,28,20,28,40,88,36,28,40,88,56,92,140,
%U 256,68,28,40,88,56,92,140,256,88,92,140,260,172,296,488,704,128,8,12,28,20,28
%N Number of toothpicks added to the toothpick structure A139250 at the n-th even round.
%C Note that these toothpicks are orthogonal to the initial toothpick in the sieve.
%C A bisection of A139251.
%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>
%Y Cf. A139250, A139251, A159791, A159792, A162793, A162795, A162796, A162797.
%K nonn
%O 0,2
%A _Omar E. Pol_, Jul 14 2009
%E Extended by _R. J. Mathar_, Sep 27 2009
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