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 A160157 #9 Feb 24 2021 02:48:18 %S A160157 0,2,8,14,32,38,56,74,116,134,152,170,212,242,284,338,440,494,512,530, %T A160157 572,602,644,698,800,866,908,962,1064,1166,1280,1418,1652,1814,1856, %U A160157 1874,1916,1946,1988,2042,2144,2210,2252,2306,2408,2510,2624,2762 %N A160157 a(n) = 2*A160120(n). %H A160157 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 A160157 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 A160157 Cf. A139250, A160120. %K A160157 nonn %O A160157 0,2 %A A160157 _Omar E. Pol_, Jun 01 2009 %E A160157 More terms from _Omar E. Pol_, Jan 09 2014