For the perfect Lie algebras sl2(C) ⋉ V_{2n-1}, the third adjoint cohomology has dimension floor((n+1)/3) and the fourth is 1-dimensional, and all perfect Lie algebras of dimension at most 9 are listed with their H^0,H^1,H^2 cohomology dimensions.
Benayadi: Structure of perfect Lie algebras without center and outer d erivations
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Cohomology of perfect Lie algebras
For the perfect Lie algebras sl2(C) ⋉ V_{2n-1}, the third adjoint cohomology has dimension floor((n+1)/3) and the fourth is 1-dimensional, and all perfect Lie algebras of dimension at most 9 are listed with their H^0,H^1,H^2 cohomology dimensions.