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 A161335 #10 Feb 24 2021 02:48:18 %S A161335 0,4,16,28,40,76,88,124,160,196,256,292,352,436,448,484,520,580,688, %T A161335 748,904,988,1096,1252,1336,1468,1624,1660,1744,1828,1936,2116,2248, %U A161335 2500,2680,2860,3064,3196,3352,3532,3712,3892,4000,4132,4360,4516,4768,5020,5224 %N A161335 a(n) = A161330(n)*2. %H A161335 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 A161335 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 A161335 Cf. A161330, A161333, A161334. %K A161335 nonn %O A161335 0,2 %A A161335 _Omar E. Pol_, Jun 09 2009 %E A161335 More terms from _Jinyuan Wang_, Mar 14 2020