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 A294962 #23 Feb 06 2019 06:10:57 %S A294962 0,1,5,13,21,33,53,69,77,101,117 %N A294962 a(n) is the total number of elements after n-th stage of a hybrid (and finite) cellular automaton formed by toothpicks, D-toothpicks and T-toothpicks on the infinite square grid (see Comments lines for precise definition). %C A294962 It seems that this cellular automaton resembles the synthesis of a molecule, a protein, etc. %C A294962 After 10th stage there are no exposed endpoints in the structure, so the structure is finished. %C A294962 A294963(n) gives the number of elements added to the structure at n-th stage. %H A294962 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 A294962 <a href="/index/Ce#cell">Index entries for sequences related to cellular automata</a> %H A294962 <a href="/index/To#toothpick">Index entries for sequences related to toothpick sequences</a> %Y A294962 Cf. A139250 (toothpicks), A160172 (T-toothpicks), A194700 (D-toothpicks), A220500, A294963. %Y A294962 For other hybrid cellular automata, see A289840, A290220, A294020, A294980. %K A294962 nonn,fini,full %O A294962 0,3 %A A294962 _Omar E. Pol_, Nov 12 2017