2 2.3 2.5 2.7 3 3.2 3.5 3.7 4 15*15 0.808 0.908 0.971 20*20 1.119 1.266 1.36 1.452 25*25 1.43 1.623 1.749 1.872 2.052 30*30 1.741 1.98 2.137 2.291 2.518 2.666 2.883 40*40 2.363 2.695 2.914 3.131 3.451 3.661 3.971 4.175 4.476 50*50 2.984 3.41 3.691 3.97 40383 4.655 5.059 5.325 5.72 60*60 3.606 4.125 4.469 4.809 5.316 5.65 6.147 6.476 6.963 65*65 3.917 4.483 4.857 5.229 5.782 6.148 6.691 7.051 7.585