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 A222176 #14 Nov 25 2013 14:55:53 %S A222176 0,1,3,5,7,11,17,21,23,27,35,43,49,59,73,81,83,87,95,107,123 %N A222176 Total number of ON states after n generations of cellular automaton based on pentagons starting near of the vertex of an infinite 72-degree wedge. %C A222176 The structure is one of the five wedges of A222180. %C A222176 The sequence gives the number of pentagons in the structure after n-th stage. A222177 (the first differences) gives the number of pentagons added at n-th stage. %C A222176 Also P-toothpick sequence starting near of the vertex of an infinite 72-degree wedge, since each pentagon can be replaced by a P-toothpick. %C A222176 For more information see A222180. %C A222176 First differs from A152998 at a(10). %H A222176 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 A222176 <a href="/index/To#toothpick">Index entries for sequences related to toothpick sequences</a> %F A222176 a(n) = (A222180(n+1) - 1)/5. %Y A222176 Cf. A139250, A152998, A222172, A222177, A222180. %K A222176 nonn,more %O A222176 0,3 %A A222176 _Omar E. Pol_, Mar 21 2013 %E A222176 Name improved by _Omar E. Pol_, Nov 24 2013