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A066992
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Integers of the form C(2n,n)*sum(i=1,n,1/phi(i)).
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0
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4, 72, 1000, 14700, 206388, 3201660, 46132944, 690153750, 8341753936986000, 127726170599795040, 1963050484817866410, 29928758453499691665, 466352632039095734625, 7143496319608441446500, 111027787209709780725315
(list; graph; refs; listen; history; internal format)
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