desolve question



Hello,
I get this and don't know how to handle it.

			       3
			      d		     2
(D11) 			      --- (f(z)) = ------
				3	        2
			      dz	   1 - z
(C12) desolve(d11,f(z));

			    !
		   2	    !			    !
		  d 
     !		   d	    !
(D12) f(z) = ILT((--- (f(z))!	   + LVAR (-- (f(z))!	  )
		    2	    !		   dz	    !
		  dz 
     !			    !z = 0
			    !z = 0

				   1			     2	    3
		     + 2 LAPLACE(------, z, LVAR) + f(0) LVAR )/LVAR , LVAR, z)
				      2
				 1 - z

I need to solve this equation to compute the 
sum(1/((2*n-1)*n*(2*n+1)),n,1,inf).
--
Andrei Zorine