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Search: id:A120107
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| A120107 |
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a(n)=sum{lcm(1,..,2(n-k)+2)/lcm(1,..,2k+2), k=0..floor(n/2)}. |
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2
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| 1, 6, 31, 425, 1331, 14084, 182533, 390855, 6192220, 117429752, 136000866, 2700408581, 13835919839, 42477252404, 1171690228133, 72397239805085, 84274330442804, 86644937313210, 2686078920033439, 3119346038772923
(list; graph; listen)
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