calculate the number of values in the triangle that are different from 1 and less than or equal to K. k>=2
1
1 1
1 2 1
1 3 3 1
1 4 6 4
1
1 5 10 10 5
1
1 6 15 20 15
6 1
e.g
for k=2
ans is 1
and k=6
ans is 10
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