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 A323179 #17 Jul 23 2025 16:00:37 %S A323179 1,1,1,1,1,2,0,0,1,1,3,0,2,1,1,1,1,4,0,0,3,0,0,0,1,1,5,0,4,3,3,3,0,1, %T A323179 1,1,1,6,0,0,7,0,0,0,0,2,0,0,1,1,7,0,6,7,7,7,0,0,2,2,2,1,1,1,1,8,0,0, %U A323179 13,0,0,0,7,2,4,0,0,0,0,0 %N A323179 Triangle read by rows giving successive states of cellular automaton generated by "Rule 30", with accumulating cell values. %C A323179 First take the sum of the values of the left neighbor, the cell itself, and the right neighbor. The next value of the cell will equal this sum if the value of the left neighbor is zero, or if the cell and its right neighbor are both zero. %C A323179 In other cases the next value of the cell will be zero. %C A323179 The pattern of nonzero cells is the same as the rule 30 CA (A070950), but the cell values grow as the CA progresses. %H A323179 Nathan M Epstein, <a href="https://i.imgur.com/ExTyd8L.png">Color visualization of A323179</a> %e A323179 Triangle begins: %e A323179 1 %e A323179 1, 1, 1 %e A323179 1, 2, 0, 0, 1 %e A323179 1, 3, 0, 2, 1, 1, 1 %e A323179 1, 4, 0, 0, 3, 0, 0, 0, 1 %Y A323179 Min(a(n), 1) = A070950(n). %K A323179 nonn,tabf %O A323179 0,6 %A A323179 _Nathan M Epstein_, Jan 10 2019