%I A059775
%S A059775 0,24,120,360,824,1664,2992,5000,7848,11808,17024,23888,32576,43432,
%T A059775 56816,73136,92616,115872,143104,174928,211808,254312,302680,357832,
%U A059775 420136,490232,568664,656360,753496,861376,980232,1111016,1254504
%N A059775 From solution to a counting problem.
%D A059775 D. Constales, Solution to Problem 10540, Amer. Math. Monthly, 108 (Feb. 
               200), 172-173.
%p A059775 [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)];
%Y A059775 Sequence in context: A137799 A114200 A069074 this_sequence A052762 A099317 
               A052760
%Y A059775 Adjacent sequences: A059772 A059773 A059774 this_sequence A059776 A059777 
               A059778
%K A059775 nonn
%O A059775 0,2
%A A059775 N. J. A. Sloane (njas(AT)research.att.com), Feb 21 2001