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 A188344 #12 Feb 24 2021 02:48:19 %S A188344 0,0,0,1,1,3,3,3,9,13,15,15,21,25,27,31,45,53,55,55,61,65,67,71,85,93, %T A188344 95,99,113,121,127,147,181,197,199,199,205,209,211,215,229,237,239, %U A188344 243,257,265,271,291,325,341,343 %N A188344 Number of circles present in the n-th generation of the Q-toothpick sequence A187210. %C A188344 See A187210 for a description of the different shapes that appear in the Q-toothpick sequence. %H A188344 Nathaniel Johnston, <a href="/A188344/b188344.txt">Table of n, a(n) for n = 0..181</a> %H A188344 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 A188344 Nathaniel Johnston, <a href="http://www.nathanieljohnston.com/2011/03/the-q-toothpick-cellular-automaton/">The Q-Toothpick Cellular Automaton</a> %H A188344 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 A188344 Cf. A187210, A188345, A188346. %K A188344 nonn %O A188344 0,6 %A A188344 _Nathaniel Johnston_, Mar 28 2011