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A066992 Integers of the form C(2n,n)*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

Table of n, a(n) for n=1..15.

CROSSREFS

Sequence in context: A119580 A209539 A139745 * A165212 A263219 A100521

Adjacent sequences: A066989 A066990 A066991 * A066993 A066994 A066995

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Jan 27 2002

STATUS

approved

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Last modified December 1 22:55 EST 2022. Contains 358485 sequences. (Running on oeis4.)