%I A060422
%S A060422 0,0,0,1,0,5,2,14,8,30,20,55,40,91,70,140,112,204,168,285,240,385,330,
%T A060422 506,440,650,572,819,728,1015,910,1240,1120,1496,1360,1785,1632,2109,
%U A060422 1938,2470,2280
%N A060422 Number of acute triangles made from vertices of a regular n-gon.
%F A060422 n(n+1)(n-1)/24 when n is odd; n(n-2)(n-4)/24 when n is even
%Y A060422 Union of A000330, A007290.
%Y A060422 Sequence in context: A085436 A158868 A104634 this_sequence A128142 A111267 
               A146343
%Y A060422 Adjacent sequences: A060419 A060420 A060421 this_sequence A060423 A060424 
               A060425
%K A060422 easy,nonn
%O A060422 0,6
%A A060422 Sen-Peng You (giawgwan(AT)single.url.com.tw), Apr 05 2001