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

%I #13 Jun 09 2016 03:10:14

%S 1,4,12,48,144,440,1816,6816,25816,101856,397944,1573464,6274560,

%T 25071152,100180872,400625360

%N a(n) = A253086(2^n-1).

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

%H <a href="/index/Ce#cell">Index entries for sequences related to cellular automata</a>

%Y Cf. A253086.

%K nonn,more

%O 0,2

%A _N. J. A. Sloane_, Feb 12 2015

%E a(10)-a(15) from _Lars Blomberg_, Jun 09 2016