A161211 - OEIS

%I #6 Feb 24 2021 02:48:18

%S 1,2,4,7,7,7

%N First differences of A161210.

%C Number of toothpicks added at the n-th round.

%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. A139251, A152980, A160161, A161210, A161213, A161215, A161217.

%K more,nonn

%O 1,2

%A _Omar E. Pol_, Jun 06 2009