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A066992 Integers of the form C(2n,n)^2 * Sum_{i=1..n} 1/phi(i). 0
4, 72, 1000, 14700, 206388, 3201660, 46132944, 690153750, 8341753936986000, 127726170599795040, 1963050484817866410, 29928758453499691665, 466352632039095734625, 7143496319608441446500, 111027787209709780725315 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
CROSSREFS
Sequence in context: A119580 A209539 A139745 * A165212 A263219 A358295
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Jan 27 2002
EXTENSIONS
Name corrected by Sean A. Irvine, Nov 27 2023
STATUS
approved

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Last modified February 28 20:40 EST 2024. Contains 370400 sequences. (Running on oeis4.)