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 A188156 #32 Feb 24 2021 02:48:19 %S A188156 22,40,54,56,70,120,134,88,70,120,150,168,246,360,326,152,70,120,150, %T A188156 168,246,360,342,232,246,376,454,568,838,1032,774,280,70,120,150,168, %U A188156 246,360,342,232,246,376,454,568,838,1032 %N A188156 If A187211 is written, starting at its fifth term, as a triangle with rows of lengths 2, 4, 8, 16, ..., the n-th row begins with the first 2^n-1 terms of the present sequence. %C A188156 Limiting behavior of the rows of the triangle in A187211. %H A188156 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 A188156 Nathaniel Johnston, <a href="http://www.nathanieljohnston.com/2011/03/the-q-toothpick-cellular-automaton/">The Q-Toothpick Cellular Automaton</a> %H A188156 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> %H A188156 <a href="/index/To#toothpick">Index entries for sequences related to toothpick sequences</a> %e A188156 The triangle from A187211 begins: %e A188156 22, 20 %e A188156 22, 40, 54, 40 %e A188156 22, 40, 54, 56, 70, 120, 134, 72 %e A188156 22, 40, 54, 56, 70, 120, 134, 88, 70, 120, 150, 168, 246, 360, 326, 136 %e A188156 ... %e A188156 Thus this sequence is 22, 40, 54, 56, 70, 120, 134, 88, 70, 120, 150, 168, 246, 360, 326... %e A188156 The final entry of the n-th row (for n >= 2) is 16 + 8(2^n - 1). %Y A188156 Cf. A147646, A187210, A187211. %K A188156 nonn %O A188156 1,1 %A A188156 _Nathaniel Johnston_, Mar 26 2011 %E A188156 a(35) corrected by _Nathaniel Johnston_ at the suggestion of _Omar E. Pol_, Mar 28 2011