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 A160716 #8 Feb 24 2021 02:48:18 %S A160716 0,2,4,10,12,18,24,42,44,50,56,74,80,98,116,170,224,226 %N A160716 a(n) = A160714(n)*2. %C A160716 The sequence gives the number of T-toothpicks in the structure after n rounds. %C A160716 See A160172 and A160714 for more information about T-toothpick sequences. %H A160716 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 A160716 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 A160716 Cf. A139250, A160172, A160173, A160714, A160724, A160726. %K A160716 more,nonn %O A160716 0,2 %A A160716 _Omar E. Pol_, Jun 02 2009