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A128407 as a triangular array

1
0-1
00-1
0000
0000-1
000001
000000-1
00000000
000000000
0000000001

A128407 as a square array

1000000000
-100000000
-10000000
0000000
-100000
10000
-1000
000
00
1
1000000000
-100000000
-10000000
0000000
-100000
10000
-1000
000
00
1