Indianians rhymes with:
louisianians, louisianians, albanians, amazonians, argentinians, armenians, athenians, augustinians, babylonians, bosnian's, bosnians, bostonians, caledonian's, carolinians, chechnyan's, chechnyans, estonians, finian's, iranians, iranians', jacksonians, jeffersonians, jordanians, lithuanians, louisianians, oregonians, orleanians, palestinian's, palestinians, palestinians', panamanians, pennsylvanians, romanians, smithsonian's, stepanian's, ukrainian's, ukrainians, washingtonians
Indianians sounds like:
imitating, imitations, indian's, indiana's, indians, indians', indonesia, indonesia's, initiating, intense, intimacy, intones, intoning, inundating, inundations