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%I #5 Mar 30 2012 18:39:09
%S 1,1,1,2,3,12,15,30,21,168,126,1260,990,792,1287,18018,5005,80080,
%T 68068,58344,50388,201552,176358,3879876,3432198,27457584,24515700,
%U 637408200,573667380,16062686640,29113619535,26466926850,24131609775
%N Denominator of sum( i+j+k = n, (i*j)/k) i,j,k >=1.
%o (PARI) a(n)=denominator(sum(i=1,n,sum(j=1,n,sum(k=1,n,if(n-i-j-k,0,1)*i*j/k))))
%Y Cf. A076174.
%K frac,nonn
%O 1,4
%A _Benoit Cloitre_, Nov 01 2002
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