A253087 a(n) = A253086(2^n-1).

1, 4, 12, 48, 144, 440, 1816, 6816, 25816, 101856, 397944, 1573464, 6274560, 25071152, 100180872, 400625360

Offset: 0

Author

N. J. A. Sloane, Feb 12 2015

Keywords

• nonn
• more

Comments

In trying to understand A253086, this subsequence looked like the best place to attack it. But there is unfortunately no obvious formula even here.

Links

• Index entries for sequences related to cellular automata

Crossrefs

Cf. A253086.

Extensions

a(10)-a(15) from Lars Blomberg, Jun 09 2016