This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A161207 #9 Feb 24 2021 02:48:18 %S A161207 1,2,4,6,8,10,12,14,12,12,18,24,30,30,28,30,20,12,18,26,34,42,50,56, %T A161207 54,44,48,64,82,80,68,66,36,12,18,26,34,42,50,58,58,54,66,90,114,126, %U A161207 122,120,102,60,48,70,94,118,142,160,162,136,130,160,204,198,160,142,68,12 %N A161207 First differences of A161206. %C A161207 Number of V-toothpicks added to the V-toothpick structure at the n-th round. %H A161207 David Applegate, <a href="/A139250/a139250.anim.html">The movie version</a> %H A161207 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 A161207 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 A161207 Cf. A139250, A139251, A160121, A160173, A161206, A161329, A161331. %K A161207 nonn %O A161207 1,2 %A A161207 _Omar E. Pol_, Jun 08 2009 %E A161207 More terms from _R. J. Mathar_, Jan 21 2010