| #### D.5.5.4 NakYoshF Procedure from library `goettsche.lib` (see goettsche_lib). Usage: NakYoshF(z, t, r, n); z, t polynomials, r, n integers Return: polynomial in z and t Purpose: computes the formula of Nakajima and Yoshioka up to degree n in t Note: zero is returned if n<0 or r<=0 Example:
    LIB "goettsche.lib";
    ring r=0, (t, z), ls;
    // get the Nakajima-Yoshioka formula for r=1 up to degree 3, i.e.,
    // the generating function for the Poincare polynomials of the
    // punctual Hilbert schemes of n planar points
    print( NakYoshF(z, t, 1, 3) );
    ==> 1+t+t2+t2z2+t3+t3z2+t3z4

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