L=1 exp=10
L=2 exp=60
L=3 exp=200
L=4 exp=400
L=5 exp=800
L=6 exp=1600
L=7 exp=3200
L=8 exp=6400
L=9 exp=12800
L=10 exp=25600
L=11 exp=48400
L=12 exp=81200
L=13 exp=124000
L=14 exp=176800
L=15 exp=239600
L=16 exp=312400
L=17 exp=395200
L=18 exp=488000
L=19 exp=590800
L=20 exp=703600