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A253767
Partial sums of A247666.
3
1, 8, 15, 40, 47, 96, 121, 224, 231, 280, 329, 504, 529, 704, 807, 1216, 1223, 1272, 1321, 1496, 1545, 1888, 2063, 2784, 2809, 2984, 3159, 3784, 3887, 4608, 5017, 6656, 6663, 6712, 6761, 6936, 6985, 7328, 7503, 8224, 8273, 8616, 8959, 10184, 10359, 11584, 12305, 15168, 15193, 15368, 15543, 16168
OFFSET
0,2
COMMENTS
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.
CROSSREFS
KEYWORD
nonn
AUTHOR
Omar E. Pol, Jan 29 2015
STATUS
approved