~/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)