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CJam, (削除) 42 (削除ここまで) 37 bytes

3li:L#,{3b"——|"2/f=s}%{,L=},_&{N+_N}/

I've counted the dashes as one byte each since the question allows to replace them with ASCII hyphens.

Try it online.

Example run

$ cjam domino.cjam <<< 3
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$ for i in {1..10}; do echo $[$(cjam domino.cjam <<< $i | wc -l)/3]; done
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