times for q*q-q

DP:
20 0.38000
30 1.31000 
40 3.26000
50 6.49000
60 11.27000
70 18.07000
80 25.70000
90 36.71000
100 50.65000

stack:
20 1.15000 
30 4.50000 
40 10.23000 
50 21.12000  
60 36.55000 
70 58.59000 
80 82.52000
90 119.56000
100 160.88000

times for q*q*q*q*q-q

DP:

20 1.04000
30 3.28000
40 7.83000
50 15.21000
60 26.37000
70 43.35000
80 64.55000
90 89.52000
100 122.40000

stack:

20 3.68000
30 11.93000
40 28.18000
50 54.20000
60 94.57000
70 153.52000
80 223.15000
