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A266216 Triangle read by rows giving successive states of cellular automaton generated by "Rule 7" initiated with a single ON (black) cell. 8
1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0

COMMENTS

Row n has length 2n+1.

REFERENCES

S. Wolfram, A New Kind of Science, Wolfram Media, 2002; p. 55.

LINKS

Robert Price, Table of n, a(n) for n = 0..9999

Eric Weisstein's World of Mathematics, Elementary Cellular Automaton

S. Wolfram, A New Kind of Science

Index entries for sequences related to cellular automata

Index to Elementary Cellular Automata

EXAMPLE

The first ten rows:

                  1

                1 1 0

              0 0 0 0 0

            1 1 1 1 1 1 1

          0 0 0 0 0 0 0 0 0

        1 1 1 1 1 1 1 1 1 1 1

      0 0 0 0 0 0 0 0 0 0 0 0 0

    1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

MATHEMATICA

rule=7; rows=20; ca=CellularAutomaton[rule, {{1}, 0}, rows-1, {All, All}]; (* Start with single black cell *) catri=Table[Take[ca[[k]], {rows-k+1, rows+k-1}], {k, 1, rows}]; (* Truncated list of each row *) Flatten[catri] (* Triangle Representation of CA *)

CROSSREFS

Sequence in context: A267936 A263013 A204269 * A266300 A266605 A266659

Adjacent sequences:  A266213 A266214 A266215 * A266217 A266218 A266219

KEYWORD

nonn,tabf,easy

AUTHOR

Robert Price, Dec 24 2015

STATUS

approved

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Last modified April 27 06:03 EDT 2017. Contains 285508 sequences.