OFFSET
0,2
COMMENTS
Also, total number of cubic ON cells after n generations in a three-dimensional structure in which A253089(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.
CROSSREFS
KEYWORD
nonn
AUTHOR
Omar E. Pol, Feb 27 2015
STATUS
approved