Declension table of ?ṛchamāna

Neuter	Singular	Dual	Plural
Nominative	ṛchamānam	ṛchamāne	ṛchamānāni
Vocative	ṛchamāna	ṛchamāne	ṛchamānāni
Accusative	ṛchamānam	ṛchamāne	ṛchamānāni
Instrumental	ṛchamānena	ṛchamānābhyām	ṛchamānaiḥ
Dative	ṛchamānāya	ṛchamānābhyām	ṛchamānebhyaḥ
Ablative	ṛchamānāt	ṛchamānābhyām	ṛchamānebhyaḥ
Genitive	ṛchamānasya	ṛchamānayoḥ	ṛchamānānām
Locative	ṛchamāne	ṛchamānayoḥ	ṛchamāneṣu

Compound ṛchamāna -

Adverb -ṛchamānam -ṛchamānāt