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A059775
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From solution to a counting problem.
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0
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0, 24, 120, 360, 824, 1664, 2992, 5000, 7848, 11808, 17024, 23888, 32576, 43432, 56816, 73136, 92616, 115872, 143104, 174928, 211808, 254312, 302680, 357832, 420136, 490232, 568664, 656360, 753496, 861376, 980232, 1111016, 1254504
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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LINKS
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MAPLE
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[seq(n*(n-1)*(n^2-n-1) + 4*add(floor(n/k^2)*phi(k), k=2..floor(sqrt(n))) - 2*add(floor(n/k)^2*phi(k), k=2..n), n=2..30)];
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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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