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matrix(QQ,24,25)
24 x 25 dense matrix over Rational Field

But in a terminal you get:

~/smc/src/smc-webapp$ sage ┌────────────────────────────────────────────────────────────────────┐ SageMath version 8.0, Release Date: 2017-07-21 Enhanced for CoCalc. └────────────────────────────────────────────────────────────────────┘ sage: matrix(QQ,24,25) 24 x 25 dense matrix over Rational Field (use the '.str()' method to see the entries)