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Search: id:A067578
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| A067578 |
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a(n)=prod(i=1,n,phi(i))*sum(i=1,n,1/phi(i)) where phi is the Euler totient function A000010(n) |
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| 1, 2, 5, 12, 52, 120, 752, 3200, 19968, 84480, 863232, 3637248, 44384256, 275152896, 2254307328, 18459131904, 298743496704, 1846819160064, 33568893960192, 274421835104256, 3340027488632832, 33963860494909440
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