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 A160789 #8 Feb 24 2021 02:48:18 %S A160789 0,0,1,0,5,4,5,2,15,20,21 %N A160789 Y-toothpick number A160120(n) minus toothpick number A139250(n). %H A160789 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 A160789 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> %H A160789 Omar E. Pol, <a href="/plot2a?name1=A160120&name2=A139250&tform1=untransformed&tform2=untransformed&shift=0&radiop1=matp&drawpoints=true&drawlines=true">OEIS, Plot 2, A160120 and A139250 vs n</a> %F A160789 a(n) = A160120(n)-A139250(n). %Y A160789 Cf. A139250, A160120. %K A160789 more,nonn %O A160789 0,5 %A A160789 _Omar E. Pol_, Jun 18 2009