1*1=1,1*2=2,1*3=3,1*4=4,1*5=5,1*6=6,1*7=7,1*8=8,1*9=92*2=4,2*3=6,2*4=8,2*5=10,2*6=12,2*7=14,2*8=16,2*9=18,3*3=9,3*4=12,3*5=15,3*6=18,3*7=21,3*8=24,3*9=27,4*4=16,4*5=20,4*6=24,4*7=28,4*8=32,4*9=36,5*5=...