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A139802
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a(1)=1, a(2)=2, a(n)=n^a(n-2).
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1
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OFFSET
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1,2
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COMMENTS
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Exponential double factorial.
The next term is too large to include.
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LINKS
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EXAMPLE
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a(1)=1;
a(2)=2;
a(3)=3^1=3;
a(4)=4^2=16;
a(5)=5^3=125;
a(6)=6^16=2821109907456;
etc.
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MATHEMATICA
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a[1]=1; a[2]=2; a[n_]:=n^a[n-2]; Array[a, 7] (* Stefano Spezia, Feb 14 2024 *)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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