cp's OEIS Frontend

A212009 Number of toothpicks or D-toothpicks added at n-th stage in the toothpick structure of A212008.

%I A212009 #10 Jan 30 2016 18:50:22
%S A212009 0,1,4,8,16,22,20,24,36,40,32,44,56,94,60,56,76,72,32,48,72,112,132,
%T A212009 140,136,168,112,132,140,238,148,120,156,136,32,48,72,112,132
%N A212009 Number of toothpicks or D-toothpicks added at n-th stage in the toothpick structure of A212008.
%C A212009 Essentially the first differences of A212008.
%H A212009 David Applegate, <a href="/A139250/a139250.anim.html">The movie version</a>
%H A212009 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>
%H A212009 <a href="/index/To#toothpick">Index entries for sequences related to toothpick sequences</a>
%F A212009 It appears that a(2^k + 2) = 32, if k >= 3.
%e A212009 When written as an irregular triangle:
%e A212009 0;
%e A212009 1;
%e A212009 4;
%e A212009 8;
%e A212009 16,22;
%e A212009 20,24,36,40;
%e A212009 32,44,56,94,60,56,76,72;
%e A212009 32,48,72,112,132,140,136,168,112,132,140,238,148,120,156,136;
%e A212009 32,48,72,112,132,...
%Y A212009 Cf. A139250, A139251, A194271, A194433, A194435, A194441, A194443, A194445, A220501.
%K A212009 nonn,tabf,more
%O A212009 0,3
%A A212009 _Omar E. Pol_, Dec 15 2012