The phoneme /aʊ/ is often mispronounced as /ɑ/, especially when it precedes /n/. This would make phonemes /aʊn/ sound like /ɑn/. Hmm, quite un-English! You want to sound English? Then fully realise the /aʊn/ sounds.
So try pronouncing these words with special attention to the /aʊn/ sounds:
The county’s Count and his hounds went to the mountain to count his brown cows browsing at the fountain foundation.