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 A323180 #17 Feb 10 2019 17:27:30 %S A323180 1,3,4,9,9,22,17,44,36,80,73,138,149,279,264,467,575,771,980,1570, %T A323180 1868,2184,3493,4288,6512,7156,11766,13609,21452,21526,38880,44374, %U A323180 53328,77009,90383,175886,126597,222489,323328,416581,622641,570846 %N A323180 Row sums of A323179. %C A323180 Sums of triangle rows of the rule 30 automaton, in which the execution of the rule has been modified as such: %C A323180 In the rule 30 CA, local cell neighborhoods are converted into a number 0-7, which is then used to determine if the central cell will be active in the next generation of the CA. %C A323180 For this version, when determining this local neighborhood number, any positive nonzero value is treated as a Boolean TRUE. 0 values operate the same way as the conventional version of rule 30. %C A323180 For example: [0],[0],[14] becomes [False],[False],[True] for the purposes of determining the local state. %C A323180 Second, instead of writing a 1 when instructed by the 8 sub-rules, instead write the sum of the three local cells. %e A323180 Triangle begins: sum %e A323180 . 1 1 %e A323180 . 1, 1, 1 3 %e A323180 . 1, 2, 0, 0, 1 4 %e A323180 . 1, 3, 0, 2, 1, 1, 1 9 %e A323180 . 1, 4, 0, 0, 3, 0, 0, 0, 1 9 %Y A323180 Cf. A323179. %K A323180 nonn %O A323180 0,2 %A A323180 _Nathan M Epstein_, Jan 10 2019