If a 6-coordinate compound had these d-counts for which would you expect a Jahn-Teller effect?

The Jahn-Teller effect is expected in coordination complexes where there are degenerate electronic states, typically involving d^1, d^2, d^3, or d^7 configurations. For a 6-coordinate compound, a d^9 configuration in a square-pyramidal geometry may also exhibit Jahn-Teller distortion. Essentially, the effect arises when the electronic configuration leads to an asymmetry that lowers the overall energy of the complex. Thus, complexes with these specific d-counts are likely candidates for the Jahn-Teller effect.