1 x 1 = 1
1 1 x 1 1 = 1 2 1
1 1 1 x 1 1 1 = 1 2 3 2 1
1 1 1 1 x 1 1 1 1 = 1 2 3 4 3 2 1
1 1 1 1 1 x 1 1 1 1 1 = 1 2 3 4 5 4 3 2 1
1 1 1 1 1 1 x 1 1 1 1 1 1 = 1 2 3 4 5 6 5 4 3 2 1
1 1 1 1 1 1 1 x 1 1 1 1 1 1 1 = 1 2 3 4 5 6 7 6 5 4 3 2 1
1 1 1 1 1 1 1 1 x 1 1 1 1 1 1 1 1 = 1 2 3 4 5 6 7 8 7 6 5 4 3 2 1
1 1 1 1 1 1 1 1 1 x 1 1 1 1 1 1 1 1 1 = 1 2 3 4 5 6 7 8 9 8 7 6 5 4 3 2 1