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

For HNNNH+ (1,2-Triazadienium)

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) 6-311+G(3df,2p) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.000669 -0.005500 -0.005500 -0.003619 -0.010510 -0.010804 -0.011369 -0.056646 -0.056919 -0.026259 -0.068779 -0.051787 -0.007196 -0.043331 -0.088501 -0.008003 -0.050772 -0.090062 -0.008292 -0.052897
MP3=FULL         -0.009881   -0.010736       -0.070593 -0.053392 -0.006617 -0.043686         -0.007693  
MP4=FULL   -0.005125     -0.009891       -0.058507   -0.071255   -0.006583 -0.043880   -0.007384 -0.051828   -0.007664 -0.054137
B2PLYP=FULL -0.000201 -0.001609 -0.001609 -0.001056 -0.003073 -0.003161 -0.003323 -0.016066 -0.016152 -0.007551 -0.019615 -0.014707 -0.002111 -0.012486   -0.002351 -0.014587   -0.002435 -0.015190
Quadratic configuration interaction QCISD(T)=FULL         -0.009808           -0.070956   -0.006518 -0.043646   -0.007319 -0.051596   -0.007596 -0.053906
Coupled Cluster CCSD=FULL         -0.009699         -0.026128 -0.070211 -0.053219 -0.006429 -0.043273 -0.090727 -0.007215 -0.051223 -0.092326 -0.007486 -0.053506
CCSD(T)=FULL         -0.009824           -0.070942 -0.053584 -0.006526 -0.043676 -0.091706 -0.007326 -0.051629 -0.093304 -0.007603 -0.053936
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) 6-311+G(3df,2p) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ daug-cc-pVDZ daug-cc-pVTZ