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 A173454 #14 Feb 24 2021 02:48:19 %S A173454 0,0,-1,-1,-3,-5,-3,1,-3,-9,-7,-3,-3,1,17,33,25,11,13,17,17,21,37,53, %T A173454 49,45,61,81,97,133,197,245,229,199,201,205,205,209,225,241,237,233, %U A173454 249,269,285,321,385,433,421,401,417,437,453,489 %N A173454 a(n) = A139250(n) - A173522(n). %H A173454 Shawn A. Broyles, <a href="/A173454/b173454.txt">Table of n, a(n) for n = 0..10000</a> %H A173454 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 A173454 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 A173454 Cf. A139250, A173069, A173522. %K A173454 sign %O A173454 0,5 %A A173454 _Omar E. Pol_, May 29 2010 %E A173454 Edited by _Omar E. Pol_, May 30 2010 %E A173454 More terms from _R. J. Mathar_, Aug 31 2010