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A227724
as
a triangular array
0
0
1
0
3
0
0
7
0
7
0
15
0
105
750
A227724
as
a square array
0
0
0
0
0
1
3
7
15
0
0
0
7
105
750
A227724
as
an upper right triangle
0
0
0
0
0
1
3
7
15
0
0
0
7
105
750
