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%I #9 Feb 24 2021 02:48:18
%S 1,2,4,2,1,2,3,1,1,2,3,3,3,5,5,2,1,2,3,2,2,4,6,5,3,5,5,2,2,4,6,1,2,3,
%T 2,2,4,6,5,3,5,5,2,2,4,6,5,4,7,8,6,8,14,17,13,10,9,8,3,3,4,5,6,7,8,7,
%U 6,8,11,14,17,19,10
%N First differences of A160800.
%C Number of toothpicks added to the spiral 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>
%Y Cf. A000045, A139250, A139251, A160426, A160427, A160800.
%K nonn
%O 1,2
%A _Omar E. Pol_, May 26 2009
%E Terms after a(32) from _Nathaniel Johnston_, Mar 30 2011
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