Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 20", based on the 5-celled von Neumann neighborhood.
A269712
Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 20", based on the 5-celled von Neumann neighborhood.
Terms
- a(0) =1a(1) =4a(2) =12a(3) =28a(4) =60a(5) =124a(6) =252a(7) =508a(8) =1020a(9) =2044a(10) =4092a(11) =8188a(12) =16380a(13) =32764a(14) =65532a(15) =131068
External references
- oeis: A269712