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 A173464 #16 Feb 24 2021 02:48:19 %S A173464 1,5,5,17,5,17,21,49,5,17,21,49,21,53,81,129,5,17,21,49,21,53,81,129, %T A173464 21,53,81,133,81,165,289,321 %N A173464 When regarded as a triangle, the rows of A162797 converge to this sequence. %H A173464 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 A173464 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 A173464 From _Omar E. Pol_, Apr 01 2011: (Start) %e A173464 If written as a triangle begins: %e A173464 1, %e A173464 5, %e A173464 5,17, %e A173464 5,17,21,49, %e A173464 5,17,21,49,21,53,81,129, %e A173464 5,17,21,49,21,53,81,129,21,53,81,133,81,165,289,321, %e A173464 ... %e A173464 It appears that the final terms of rows give A000337. %e A173464 It appears that row sums give A010036. %e A173464 (End) %Y A173464 Cf. A139250, A162795, A162796, A162797. %Y A173464 Cf. A010036, A162793, A162794. - _Omar E. Pol_, Apr 01 2011 %K A173464 nonn,more %O A173464 1,2 %A A173464 _Omar E. Pol_, Feb 22 2010 %E A173464 More terms a(20)-a(32) from _Omar E. Pol_, Apr 01 2011