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A122431 as a triangular array

1
31
331
1331
01331
001331
0001331
00001331
000001331
0000001331
00000001

A122431 as a square array

13310000000
1331000000
133100000
13310000
1331000
133100
13310
1331
13
1
13310000000
1331000000
133100000
13310000
1331000
133100
13310
1331
13
1