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 A160728 #6 Feb 24 2021 02:48:18 %S A160728 0,6,12,24,48,72,96,120,144,192,288,384,432,456,480,528 %N A160728 Toothpick cube: a(n) = A160408(n)*6. %C A160728 Also, 6 times the toothpick pyramid A160408. %C A160728 The sequence gives the number of toothpicks after n rounds. A160729 (the first differences) gives the number added at the n-th round. %C A160728 See also the entry A139250 for more information about the toothpick sequences. %H A160728 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 A160728 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 A160728 Toothpick triangle: A160406. Toothpick pyramid: A160408. %Y A160728 Cf. A139250, A139251, A160160, A160729. %K A160728 more,nonn %O A160728 0,2 %A A160728 _Omar E. Pol_, Jun 06 2009