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A066041
as
a triangular array
1
2
1
2
3
1
2
3
4
1
2
3
4
5
1
2
4
6
5
6
1
3
6
8
9
7
7
1
3
6
11
12
12
9
8
1
A066041
as
a square array
1
2
2
2
2
2
3
3
1
3
3
3
4
6
6
1
4
4
6
8
11
1
5
5
9
12
1
6
7
12
1
7
9
1
8
1
A066041
as
an upper right triangle
1
2
2
2
2
2
3
3
1
3
3
3
4
6
6
1
4
4
6
8
11
1
5
5
9
12
1
6
7
12
1
7
9
1
8
1