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 A170888 #10 Feb 24 2021 02:48:19 %S A170888 0,1,3,7,11,15,21,31,39,43,49,59,69,81,101,127,143,147,153,163,173, %T A170888 185,205,231,249,261,281,309,339,381,445,511,543,547,553,563,573,585, %U A170888 605,631,649,661,681,709,739,781,845,911,945,957,977,1005,1035,1077,1141 %N A170888 Similar to A160406, but always staying outside the wedge, starting at stage 0 with a vertical half-toothpick which protrudes from the vertex of the wedge. %C A170888 See A170889 for the first differences. %H A170888 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 A170888 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 A170888 Cf. A139250, A170886, A170889, A170890, A170892. %K A170888 nonn %O A170888 0,3 %A A170888 _Omar E. Pol_, Jan 09 2010 %E A170888 Terms beyond a(10) from _R. J. Mathar_, Jan 25 2010