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A333120
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a(1) = 1, a(n+1) = Sum_{d|n} a(d)^2.
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1
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1, 1, 2, 5, 27, 730, 532906, 283988804837, 80649641272747674596596, 6504364637422885153991868441922618991334787221, 42306759336557340251452848811862268800945638555088445693345741249091605099189510505344903572
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OFFSET
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1,3
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LINKS
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FORMULA
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a(n) ~ c^(2^n), where c = 1.10850959824748299278192262396861284785509520261602375885447280659977154... - Vaclav Kotesovec, Mar 08 2020
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MATHEMATICA
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a[1] = 1; a[n_] := a[n] = Sum[a[d]^2, {d, Divisors[n - 1]}]; Table[a[n], {n, 1, 11}]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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