A246023 a(n) = A070952(2^n).

3, 3, 4, 7, 15, 26, 64, 132, 253, 498, 1033, 2027, 4089, 8141, 16416, 32715, 65722, 131374, 262159, 524211, 1048630, 2097291, 4195039, 8387885

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 A329216 A266616

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