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 A335794 #14 Jul 03 2020 16:29:06 %S A335794 0,1,7,13,31,37,67,85,139,145,175,205,283,301,391,445,595,601,631,661, %T A335794 739,769,895,973,1195,1213,1303,1393,1627,1681,1927,2077,2467,2473, %U A335794 2503,2533,2611,2641,2767,2845,3067,3097,3223,3349,3667,3745,4111,4333,4939,4957 %N A335794 Number of ON cells at n-th generation in an "Ulam-Warburton and Friedkin Replicator" hybrid two-dimensional cellular automaton. %C A335794 This 2D CA uses the neighborhood: %C A335794 [0 X X] %C A335794 [X X X] %C A335794 [X X 0] %C A335794 If a cell has an even number of ON neighbors and it is currently OFF, stay OFF; otherwise turn ON. %C A335794 The results are similar to those for A151723, but with a distorted grid. %C A335794 (The "look" keyword refers to the animation. - _N. J. A. Sloane_, Jul 03 2020) %D A335794 S. M. Ulam, On some mathematical problems connected with patterns of growth of figures, pp. 215-224 of R. E. Bellman, ed., Mathematical Problems in the Biological Sciences, Proc. Sympos. Applied Math., Vol. 14, Amer. Math. Soc., 1962 (see Example 6, page 224). %H A335794 Cody B. Duncan, <a href="https://videopress.com/v/KlNitD1U">Animation</a> %Y A335794 Cf. A102900, A147562, A151723, A247666, A335795. %K A335794 nonn,look %O A335794 0,3 %A A335794 _Cody B Duncan_, Jun 23 2020