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Ruby, 53 bytes ->n{n-=3;[?╔+?╦*n+?╗,*[?╠+?╬*n+?╣]*(n+1),?╚+?╩*n+?╝]} Try it online!
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# [Ruby], 53 bytes ```ruby ->n{n-=3;[?╔+?╦*n+?╗,*[?╠+?╬*n+?╣]*(n+1),?╚+?╩*n+?╝]} ``` [Try it online!][TIO-ksu3t2ur] [Ruby]: https://www.ruby-lang.org/ [TIO-ksu3t2ur]: https://tio.run/##KypNqvyfZvtf1y6vOk/X1tg62v7R1CnaQGKZVh6Imq6jBRJaAGKvgQgtjtXSyNM21NQBsmeBBFZCxOfG1v7Ps01PLSnWK8mPz@QqUEjT08jT/G8BAA "Ruby – Try It Online"