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 A160423 #9 Feb 24 2021 02:48:18 %S A160423 7,12,22,22,24,44,62,42,24,44,64,68,92,148,162,82,24,44,64,68,92,148, %T A160423 164,108,92,152,196,228,332,456,402,162,24,44,64,68,92,148,164,108,92, %U A160423 152,196,228,332,456,404,188 %N A160423 First differences of A160422. %H A160423 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 A160423 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 A160423 Cf. A139250, A139251, A160420, A160421, A160422. %K A160423 nonn %O A160423 1,1 %A A160423 _Omar E. Pol_, Jun 01 2009 %E A160423 More terms from _Nathaniel Johnston_, Nov 13 2010