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 A151728 #7 Feb 24 2021 02:48:18 %S A151728 1,5,5,11,7,15,19,23,7,15,21,29,29,49,59,47,7,15,21,29,29,49,61,53,29, %T A151728 51,71,87,107,157,163,95,7,15,21,29,29,49,61,53,29,51,71,87,107,157, %U A151728 165,101,29,51,71,87,107,159,175,135,109,173,229,281,371,477 %N A151728 A151727/4. %H A151728 David Applegate, <a href="/A139250/a139250.anim.html">The movie version</a> [See A151725, variant] %H A151728 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 A151728 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 A151728 Cf. A151727, A151737, A151747, A170880. Equals 2*A151729 + 1. %K A151728 nonn %O A151728 0,2 %A A151728 _N. J. A. Sloane_, Jun 14 2009