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A231205
as
a triangular array
0
1
1
2
1
2
3
2
2
3
4
2
5
A231205
as
a square array
0
1
2
3
4
1
1
2
2
2
2
5
3
A231205
as
an upper right triangle
0
1
2
3
4
1
1
2
2
2
2
5
3
