3n - 6 July 8, 2019 16 32 64 128 3n 6 3n 6 vibrational modes 3n 6 18 3n 6 degrees of freedom 3n 6 7 3n 6 15 3n 6 n 2 3n 6 3 3n 6 2 3n 6 5n 7 3n 6 5
