OFFSET
0,3
COMMENTS
The structure looks like a tree which arises from one of the four spokes of the structure of the cellular automaton of A170896.
a(n) is the total number of ON cells after n-th stage.
For n >> 1 the structure looks like a square which is rotated 45 degrees.
LINKS
FORMULA
a(n) = (A170896(n+1) - 1)/4.
CROSSREFS
KEYWORD
nonn
AUTHOR
Omar E. Pol, Jan 12 2016
STATUS
approved