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Totally symmetric singlets for 2 or (2nir -2) electrons

n = 2         a = 0        b = - nir    
n = (2nir - 2)         a = $\displaystyle {\frac{{n_{ir}(n_{ir}-2)}}{{(n_{ir}-1)^2}}}$    
    b = $\displaystyle {\frac{{n_{ir}(n_{ir}-3)}}{{(n_{ir}-1)^2}}}$    

This covers the 1 S states of p2 , p4 , d2 , d8 , etc.



TURBOMOLE M