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A090033
as
a triangular array
0
1
6
2
21
31
3
36
53
80
4
55
84
A090033
as
a square array
0
1
2
3
4
6
21
36
55
31
53
84
80
A090033
as
an upper right triangle
0
1
2
3
4
6
21
36
55
31
53
84
80