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 A160714 #6 Feb 24 2021 02:48:18 %S A160714 0,1,2,5,6,9,12,21,22,25,28,37,40,49,58,85,112,113 %N A160714 T-toothpick sequence starting at the corner of an infinite square, but with angle = Pi/4. %C A160714 The sequence gives the number of T-toothpicks after n rounds. %C A160714 See A160172 for more information about T-toothpick sequences. %H A160714 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 A160714 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 A160714 Cf. A139250, A160172, A160173. %K A160714 more,nonn %O A160714 0,3 %A A160714 _Omar E. Pol_, Jun 02 2009