A066992 - OEIS

%I #8 Nov 27 2023 21:46:01

%S 4,72,1000,14700,206388,3201660,46132944,690153750,8341753936986000,

%T 127726170599795040,1963050484817866410,29928758453499691665,

%U 466352632039095734625,7143496319608441446500,111027787209709780725315

%N Integers of the form C(2n,n)^2 * Sum_{i=1..n} 1/phi(i).

%K nonn

%O 1,1

%A _Benoit Cloitre_, Jan 27 2002

%E Name corrected by _Sean A. Irvine_, Nov 27 2023