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%I #19 Feb 24 2021 02:48:18
%S 0,2,6,6,6,18,6,18,18,18,30,18,30,42,6,18,18,30,54,30,78,42,54,78,42,
%T 66,78,18,42,42,54,90,66,126,90,90,102,66,78,90,90,90,54,66,114,78,
%U 126,126,102,102,138,102,162,102,114,162,126,162,114,102,102,126,186,186,150,138,126,162,162,186,198,114,114,162
%N First differences of A161330.
%C Number of E-toothpicks added to the snowflake structure at n-th round.
%H David Applegate, <a href="/A161331/b161331.txt">Table of n, a(n) for n = 0..1000</a>
%H David Applegate, <a href="/A139250/a139250.anim.html">The movie version</a>
%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, A160121, A160173, A161328, A161329, A161330.
%K nonn
%O 0,2
%A _Omar E. Pol_, Jun 07 2009
%E More terms from _David Applegate_, Dec 13 2012
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