Mayamatam 18.31

18.31

koṭirityevamucyante pañca varṇalupāḥ kramāt
yugmāṃśe'yugmasaṃkhyābhirayugme yugmasaṃkhyayā

and the corner point: thus five classes of rafters are spoken of in order; / in an even part with odd numbers, and in an odd [part] with even numbers.