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A135387 as a triangular array

2
12
012
0012
00012
000012
0000012
00000012
000000012

A135387 as a square array

210000000
21000000
2100000
210000
21000
2100
210
21
2

A135387 as an upper right triangle

210000000
21000000
2100000
210000
21000
2100
210
21
2

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Last modified July 11 20:49 EDT 2024. Contains 374234 sequences. (Running on oeis4.)