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 A261313 #22 Feb 24 2021 02:48:19 %S A261313 9,0,2,6,1,1,6,5,6,9,0,6,2,4,4,2,7,1,7,9,2,8,0,2,6,8,4,5,6,0,8,0,0,2, %T A261313 4,7,0,2,0,4,0,8,2,7,6,6,5,9,9,1,6,6,0,7,9,5,1,8,2,5,8,6,7,3,9,6,6,6, %U A261313 2,1,5,2,5,0,4,4,3,3,8,5,2,7,6,6,3,8,3 %N A261313 Decimal expansion of the lower limit of A147562(i)/i^2. %C A261313 Evidently twice the lower limit of A139250(n)/n^2 and thus twice A195853. %D A261313 D. Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata, Congressus Numerantium, Vol. 206 (2010), 157-191 %H A261313 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.], which is also available at <a href="http://arxiv.org/abs/1004.3036">arXiv:1004.3036v2</a>, [math.CO], 2010. %H A261313 Steven R. Finch, <a href="/A139250/a139250_1.pdf">Toothpicks and Live Cells</a>, July 21, 2015. [Cached copy, with permission of the author] %H A261313 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> %e A261313 0.90261165.. %Y A261313 Cf. A139250, A170927, A147562, A195853, A260239. %K A261313 nonn,cons %O A261313 0,1 %A A261313 _Robert Price_, Aug 14 2015 %E A261313 Name and first 10 terms suggested by _Steven Finch_, Jul 21 2015