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a(n) = Fibonacci(8^n).
7

%I #6 Jun 10 2018 13:51:39

%S 1,21,10610209857723

%N a(n) = Fibonacci(8^n).

%H Alois P. Heinz, <a href="/A250487/b250487.txt">Table of n, a(n) for n = 0..4</a>

%F a(n) = A000045(8^n).

%p a:= n-> (<<0|1>, <1|1>>^(8^n))[1, 2]:

%p seq(a(n), n=0..4);

%Y Row n=8 of A250486.

%Y Cf. A000045.

%K nonn

%O 0,2

%A _Alois P. Heinz_, Nov 24 2014