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 A172305 #17 Feb 24 2021 02:48:19 %S A172305 0,2,4,8,8,8,16,16,8,16,24,24,32,24,48,40,24,16,24,40,48,40,56,56,64, %T A172305 64,72,56,64,48,80,88,32,32,64,72,64,40,64,80,96,104,144,96,128,120, %U A172305 160,112,96,80,128,128,144,88,136,128,136,144,168,168,216,160,192,168,64,80,128 %N A172305 Number of L-toothpicks added to the L-toothpick structure of A172304 at the n-th stage. %H A172305 Robert Price, <a href="/A172305/b172305.txt">Table of n, a(n) for n = 0..202</a> %H A172305 David Applegate, <a href="/A139250/a139250.anim.html">The movie version</a> %H A172305 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 A172305 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 A172305 Cf. First differences of A172304. %Y A172305 Cf. A139250, A139251, A172304, A172306, A172307, A172308, A172309, A172310, A172311, A172312, A172313. %K A172305 nonn %O A172305 0,2 %A A172305 _Omar E. Pol_, Feb 06 2010 %E A172305 More terms from _Colin Barker_, Apr 19 2015 %E A172305 a(49)-a(66) from _Robert Price_, Jun 17 2019