Masculine Feminine Neuter
Nominative einer eine eines or eins1
Accusative einen eine eines or eins1
Dative einem einer einem

1Typically in the spoken language and in informal writing, eines is shortened to eins for the Neuter Nominative and Accusative Singular.
Note: while genitive forms do exist (Masculine and Neuter - eines and Feminine - einer), they are not commonly used. Typically a construction with von + dative case is used instead.

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