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%I #6 Oct 04 2015 20:44:36
%S 1,-3,9,-12,-99,1107,-7038,33345,-113643,151593,1547469,-17376120,
%T 112734378,-544200660,1884830229,-2551628817,-26299018683,
%U 298555990425,-1956243650733,9538198578972,-33464928293199,47571625958796,452674080810576,-5260288747038957,34841458485708282,-171603777320158968
%N a(n) = coefficient of x^n in the expansion of Product_{k>=1} (1-x^k)^(3*n).
%p C3:=proc(k) local t1,n;
%p t1:=mul((1-x^n)^(3*k),n=1..k+2);
%p series(t1,x,k+1);
%p coeff(%,x,k);
%p end;
%p [seq(C3(i),i=0..30)];
%Y Bisections: A262540, A262541.
%K sign
%O 0,2
%A _N. J. A. Sloane_, Oct 04 2015
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