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Search: id:A120106
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| A120106 |
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a(n)=sum{lcm(1,..,2n+2)/lcm(1,..,2k+2), k=0..n}. |
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| 1, 7, 36, 505, 1516, 16677, 216802, 433605, 7371286, 140054435, 140054436, 3221252029, 16106260146, 48318780439, 1401244632732, 86877167229385, 86877167229386, 86877167229387, 3214455187487320, 3214455187487321
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