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A118171 Decimal representation of n-th iteration of the Rule 158 elementary cellular automaton starting with a single black cell. 1
1, 7, 29, 115, 477, 1843, 7645, 29491, 122333, 471859, 1957341, 7549747, 31317469, 120795955, 501079517, 1932735283, 8017272285, 30923764531, 128276356573, 494780232499, 2052421705181, 7916483719987, 32838747282909 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..22.

Eric Weisstein's World of Mathematics, Rule 158

Eric Weisstein's World of Mathematics, Elementary Cellular Automaton

FORMULA

a(n) = (1/30)*(-16+(-4)^n-10*(-1)^n+55*4^n)

EXAMPLE

            1;

         1, 1, 1;

      1, 1, 1, 0, 1;

   1, 1, 1, 0, 0, 1, 1;

1, 1, 1, 0, 1, 1, 1, 0, 1;

...

CROSSREFS

Cf. A071037.

Sequence in context: A049349 A124828 A037094 * A072261 A066744 A037576

Adjacent sequences:  A118168 A118169 A118170 * A118172 A118173 A118174

KEYWORD

nonn,base

AUTHOR

Eric W. Weisstein, Apr 13 2006

STATUS

approved

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Last modified April 15 23:31 EDT 2014. Contains 240534 sequences.