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A170887 First differences of toothpick sequence A170886.

%I A170887 #26 Feb 24 2021 02:48:19
%S A170887 0,1,2,2,2,4,6,6,6,8,12,6,8,12,18,14,14,20,20,6,8,12,18,14,16,24,26,
%T A170887 16,24,38,46,38,42,52,36,6,8,12,18,14,16,24,26,16,24,38,46,38,44,56,
%U A170887 42,16,24,38,46,40,52,70,64,52,82,118,126,114,130,132,68,6,8,12,18,14,16,24
%N A170887 First differences of toothpick sequence A170886.
%C A170887 Number of toothpicks added at n-th stage to the toothpick structure of A170886. - _Omar E. Pol_, Jan 31 2013
%H A170887 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 A170887 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>
%e A170887 From _Omar E. Pol_, Jan 30 2013: (Start)
%e A170887 If written as an irregular triangle in which rows 0..3 have length 1, it appears that row j has length 2^(j-4), if j >= 4. - _Omar E. Pol_, Jan 31 2013
%e A170887 0;
%e A170887 1;
%e A170887 2;
%e A170887 2;
%e A170887 2;
%e A170887 4,6;
%e A170887 6,6,8,12;
%e A170887 6,8,12,18,14,14,20,20;
%e A170887 6,8,12,18,14,16,24,26,16,24,38,46,38,42,52,36;
%e A170887 6,8,12,18,14,16,24,26,16,24,38,46,38,44,56,42,16,24,38,46,40,52,70,64,52,82,118,126,114,130,132,68;
%e A170887 6,8,12,18,14,16,24,...
%e A170887 (End)
%Y A170887 Cf. A139250, A139251, A160407, A170886, A170889, A170891, A170893.
%K A170887 nonn,tabf
%O A170887 0,3
%A A170887 _Omar E. Pol_, Jan 09 2010
%E A170887 More terms from _R. J. Mathar_, Jan 25 2010