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A118173 Decimal representation of n-th iteration of the Rule 188 elementary cellular automaton starting with a single black cell. 1
1, 3, 5, 15, 29, 55, 93, 247, 477, 887, 1501, 3959, 7645, 14199, 24029, 63351, 122333, 227191, 384477, 1013623, 1957341, 3635063, 6151645, 16217975, 31317469, 58161015, 98426333, 259487607, 501079517, 930576247, 1574821341, 4151801719 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..31.

Eric Weisstein's World of Mathematics, Rule 188

Eric Weisstein's World of Mathematics, Elementary Cellular Automaton

FORMULA

a(n odd) = (1/30)*(-14+3*I*(2*I)^n+55*2^n), a(n even) = (1/15)*(-13+3*(2*I)^n+25*2^n).

EXAMPLE

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

CROSSREFS

Cf. A118174.

Sequence in context: A146457 A051044 A003536 * A079450 A166956 A048738

Adjacent sequences:  A118170 A118171 A118172 * A118174 A118175 A118176

KEYWORD

nonn,base

AUTHOR

Eric W. Weisstein, Apr 13 2006

STATUS

approved

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Last modified April 24 04:54 EDT 2014. Contains 240947 sequences.