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

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

Offset

0,2

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

Table of n, a(n) for n=0..15.

Index entries for sequences related to cellular automata

Crossrefs

Cf. A253086.

Sequence in context: A032380 A057346 A255230 * A262414 A081620 A282023

Adjacent sequences: A253084 A253085 A253086 * A253088 A253089 A253090

Keyword

nonn,more

Author

N. J. A. Sloane, Feb 12 2015

Extensions

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

Status

approved