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 A253908 #47 Dec 31 2020 11:11:15 %S A253908 1,6,11,28,33,58,75,136,141,166,191,276,293,378,439,656,661,686,711, %T A253908 796,821,946,1031,1336,1353,1438,1523,1812,1873,2178,2395,3168,3173, %U A253908 3198,3223,3308,3333,3458,3543,3848,3873,3998,4123,4548,4633,5058,5363,6448,6465,6550,6635,6924,7009,7434,7723,8760,8821,9126,9431,10468 %N A253908 Partial sums of A072272. %C A253908 Also, total number of cubic ON cells after n generations in a three-dimensional cellular automaton where A072272(n) gives the number of cubic ON cells in the n-th level of the structure starting from the top. An ON cell remains ON forever. The structure looks like an irregular stepped pyramid. %H A253908 N. J. A. Sloane, <a href="/A253908/b253908.txt">Table of n, a(n) for n = 0..8192</a> %H A253908 N. J. A. Sloane, <a href="http://arxiv.org/abs/1503.01168">On the Number of ON Cells in Cellular Automata</a>, arXiv:1503.01168, 2015 %H A253908 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 A253908 <a href="/index/Ce#cell">Index entries for sequences related to cellular automata</a> %Y A253908 Cf. A072272, A116520, A245542, A253767. %K A253908 nonn %O A253908 0,2 %A A253908 _Omar E. Pol_, Jan 27 2015 %E A253908 Offset changed to 0 by _N. J. A. Sloane_, Feb 06 2015