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A066019
as
a triangular array
1
2
1
2
3
1
2
3
4
1
3
5
5
5
1
3
6
8
7
6
1
3
8
12
12
9
7
1
4
9
17
20
20
12
8
1
A066019
as
a square array
1
2
2
2
3
3
3
4
1
3
3
5
6
8
9
1
4
5
8
12
17
1
5
7
12
20
1
6
9
20
1
7
12
1
8
1
A066019
as
an upper right triangle
1
2
2
2
3
3
3
4
1
3
3
5
6
8
9
1
4
5
8
12
17
1
5
7
12
20
1
6
9
20
1
7
12
1
8
1