OFFSET
1,3
COMMENTS
An explanation of the Hensel notation used to define the cellular automaton rule can be found on the LifeWiki (see links).
FORMULA
With the exception of a(1), all values of n for which a(n) = 0 are of the form 2^m - 2 for some integer m (A000918).
EXAMPLE
a(4) = 2 because a 1 X 4 line oscillates with period 2 in this cellular automaton.
CROSSREFS
KEYWORD
nonn
AUTHOR
WG Zeist, Jan 26 2018
STATUS
approved