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%I #7 Mar 08 2020 08:39:06
%S 1,1,2,5,27,730,532906,283988804837,80649641272747674596596,
%T 6504364637422885153991868441922618991334787221,
%U 42306759336557340251452848811862268800945638555088445693345741249091605099189510505344903572
%N a(1) = 1, a(n+1) = Sum_{d|n} a(d)^2.
%F a(n) ~ c^(2^n), where c = 1.10850959824748299278192262396861284785509520261602375885447280659977154... - _Vaclav Kotesovec_, Mar 08 2020
%t a[1] = 1; a[n_] := a[n] = Sum[a[d]^2, {d, Divisors[n - 1]}]; Table[a[n], {n, 1, 11}]
%Y Cf. A003238, A007018, A082588.
%K nonn
%O 1,3
%A _Ilya Gutkovskiy_, Mar 08 2020
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