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A269566
Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 622", based on the 5-celled von Neumann neighborhood.
0
1, 5, 21, 69, 309, 1077, 4661, 19173, 74917, 310285, 1234813, 4909789, 19434725, 76878941, 304281693, 1205650205
OFFSET
0,2
COMMENTS
Initialized with a single black (ON) cell at stage zero.
REFERENCES
S. Wolfram, A New Kind of Science, Wolfram Media, 2002; p. 170.
MATHEMATICA
rule=622; stages=300; ca=CellularAutomaton[ {rule, {2, {{0, 2, 0}, {2, 1, 2}, {0, 2, 0}}}, {1, 1}}, {{{1}}, 0}, stages]; (* Start with single black cell *) on=Map[Function[Apply[Plus, Flatten[#1]]], ca]; (* Count ON cells at each stage *) Part[on, 2^Range[0, Log[2, stages]]]
CROSSREFS
Cf. A269522.
Sequence in context: A203287 A296720 A099899 * A271492 A202462 A354701
KEYWORD
nonn,more
AUTHOR
Robert Price, Feb 29 2016
EXTENSIONS
a(9)-a(15) from Lars Blomberg, Jul 16 2016
STATUS
approved