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%I #29 Dec 31 2020 11:11:15
%S 1,8,15,40,47,96,121,224,231,280,329,504,529,704,807,1216,1223,1272,
%T 1321,1496,1545,1888,2063,2784,2809,2984,3159,3784,3887,4608,5017,
%U 6656,6663,6712,6761,6936,6985,7328,7503,8224,8273,8616,8959,10184,10359,11584,12305,15168,15193,15368,15543,16168
%N Partial sums of A247666.
%C Also, total number of ON cells after n generations in a three-dimensional cellular automaton where A247666(n) gives the number of ON cells in the n-th level of the structure starting from the top. An ON cell remains ON forever. An ON cell is an hexagonal prism of height 1. We start with a single ON cell. The structure looks like an irregular stepped pyramid, apparently with a like-hexagonal base.
%H 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 <a href="/index/Ce#cell">Index entries for sequences related to cellular automata</a>
%Y Cf. A116520, A245542, A247666, A253908.
%K nonn
%O 0,2
%A _Omar E. Pol_, Jan 29 2015
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