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A204431 as a triangular array

2
11
000
2222
11111
000000
2222222
11111111
000000000
2222222222
11111111111
000000000000
2222222222222
11111111

A204431 as a square array

21021021021021
1021021021021
021021021021
21021021021
1021021021
021021021
21021021
1021021
02102
2102
102
02
2

A204431 as an upper right triangle

21021021021021
1021021021021
021021021021
21021021021
1021021021
021021021
21021021
1021021
02102
2102
102
02
2

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Last modified August 18 12:13 EDT 2024. Contains 375269 sequences. (Running on oeis4.)