Where (or How) can I find Fourier expansion of antiholomorphic (antianalytic) version of modular J-invariant, i.e. Fourier[ J( ̅t ) ].

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It is known that Fourier expansion of the modular J-invariant is J(q)= 1/q + 196884q + ... It would be greatly appreciated if someone advise me where (or how) can I find the Fourier expansion of antiholomorphic (antianalytic) version of J-invariant, i.e. Fourier[ J( ̅t ) ]. Thanks so much.