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A269629
First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 630", based on the 5-celled von Neumann neighborhood.
0
4, 4, 12, 8, 16, 20, 24, 36, 8, 28, 20, 32, 48, 16, 56, 12, 148, 28, 52, 4, 76, 20, 112, 24, 96, 104, 24, -36, 204, -8, 164, 32, 352, -180, 304, -52, 200, -24, 232, -64, 200, 36, 188, -32, 284, 172, -24, 260, 128, 204, 128, -108, 256, -24, 396, -68, 172, 256
OFFSET
0,1
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=630; 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 *) Table[on[[i+1]]-on[[i]], {i, 1, Length[on]-1}]
CROSSREFS
Cf. A269523.
Sequence in context: A169648 A273742 A169710 * A241496 A273412 A206488
KEYWORD
sign,easy
AUTHOR
Robert Price, Mar 01 2016
STATUS
approved