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 A182837 #9 Feb 24 2021 02:48:19 %S A182837 0,1,2,4,8,12,12,12,20,20,16,20 %N A182837 Number of toothpick added at n-th stage to the toothpick structure of A182836. %C A182837 First differences of A182836. %H A182837 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 A182837 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 A182837 <a href="/index/To#toothpick">Index entries for sequences related to toothpick sequences</a> %Y A182837 Cf. A139250, A139251, A152980, A182633, A182635, A182836, A182841. %K A182837 nonn,more %O A182837 0,3 %A A182837 _Omar E. Pol_, Dec 12 2010