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A068338
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n!^2 * sum{k=1 to n} mu(k)/k^2, where mu(k) is the Moebius function.
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0
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1, 3, 23, 368, 8624, 324864, 15399936, 985595904, 79833268224, 8115008716800, 968747865292800, 139499692602163200, 23346005516963020800, 4614592869368384716800, 1045883450064438558720000
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OFFSET
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1,2
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LINKS
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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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