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A246023 A070952(2^n). 4
3, 3, 4, 7, 15, 26, 64, 132, 253, 498, 1033, 2027, 4089, 8141, 16416, 32715, 65722, 131374, 262159, 524211, 1048630, 2097291, 4195039, 8387885 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Arises from studying behavior of 1-D CA defined by Rule 30 when started with a single ON cell.

I would very much like to see a recurrence or formula.

Subtracting 2^n gives 2, 1, 0, -1, -1, -6, 0, 4, -3, -14, 9, -21, -7, -51, ...

LINKS

Table of n, a(n) for n=0..23.

CROSSREFS

Cf. A070952, A246024, A246597.

Sequence in context: A298914 A205116 A011959 * A049927 A266616 A147679

Adjacent sequences:  A246020 A246021 A246022 * A246024 A246025 A246026

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Aug 14 2014

EXTENSIONS

a(14)-a(23) from Hiroaki Yamanouchi, Sep 12 2014

STATUS

approved

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Last modified August 20 05:25 EDT 2019. Contains 326139 sequences. (Running on oeis4.)