1
 2  4
 3  6  9
 4  8 12 16
 5 10 15 20 25
 6 12 18 24 30 36
 7 14 21 28 35 42 49

for i in range (1,8):
    k=0
    for j in range (1,i+1):
        k=k+i
        print k,
    print

1
2 4
3 6 9
4 8 12 16
5 10 15 20 25
6 12 18 24 30 36
7 14 21 28 35 42 49