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

Author

N. J. A. Sloane, Aug 14 2014

Keywords

• nonn
• more

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, ...

Crossrefs

Cf. A070952, A246024, A246597.

Extensions

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