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Energy differences between frozen core and all electrons correlated.
MP2, MP3, MP4, B2PLYP, CCSD, and CCSD(T)

For BeN- (Beryllium mononitride anion)

Energies in Hartree
Methods with standard basis sets
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVTZ cc-pV(T+d)Z
Moller Plesset perturbation MP2=FULL -0.000658 -0.002694 -0.002694 -0.002180 -0.007269 -0.007269 -0.007502 -0.033729 -0.033729 -0.012694 -0.003424 -0.021854 -0.050132 -0.026274 -0.021854
MP3=FULL         -0.006803   -0.029108                
Coupled Cluster CCSD(T)=FULL                         -0.053754    
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVTZ cc-pV(T+d)Z