The ABC school is a graduate school in Texas. The school opened to an inaugural class of 30 students last year.
or
The ABC school is a graduate school in Texas. The school opened to the inaugural class of 30 students last year.
I thought it should be "an inaugural class of 30 students," since this entity is mentioned for the first time in the context. But the sentence I came across here reads:
The Dell Medical School is the graduate medical school of The University of Texas at Austin in Austin, Texas. The school opened to the inaugural class of 50 students in the summer of 2016 as the newest of 18 colleges and schools on the UT Austin campus.
Does the use of the definite article here strike you as odd/wrong?